Welcome !

Impromptu Concert Series was started in 2019 by Eddy Isenberg and Ethan Rotenberg to provide a platform for performers to showcase their vocal abilities while respecting their time commitment to a project.

All Impromptu Concerts feature non-union entertainers working under a low-commitment rehearsal process. After selecting the show, we audition and cast quickly. Then, in a matter of weeks, the singers mount a concert that is somewhat, well, impromptu.

After a long pause because of the Covid pandemic we are starting back with an OPEN MIC NIGHT on May 13, 2023 at Flash on Church Street.

Our FRONT LAWN SERIES will commence in the summer of 2023. Details and dates will be posted as we get closer.

We hope you enjoy our concerts and look forward to you being a regular audience member!

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Our Next Show

Front Lawn Final Concert

The Final Front Lawn Concert of the 2023 season

Come hear this talented company of singers perform a set of
Musical Theatre, Opera, and Pop music selections!

Allie Jeffery
Courtney Day
Dicle Su
Emily Klatt
Georgia Grant
Hannah Crawford
Julianna Ozorio
Rosemary Njenga
Serena Hajee

Saturday September 16, 2023
Concert starts at 2:00pm
Withrow Park & Wolfrey Avenue
(at the Tennis Courts)

FREE, as always
Tip Jar will be available
Virtual Tip Jar also online

Bring your outdoor chairs and picnic blankets!

Hosted By:
Eddy Isenberg

Music Director / Piano Accompanist:
Ethan Rotenberg

We do appreciate all donations as they help
us cover the cost of putting on the concert.

Our 2019 Season Began with:

BROADWAY – The Early Years! was an exploration of the music that inspired and formed Broadway’s golden age.

Some show pictures:

Here's a few unsolicited Facebook reviews we received:

BRAVO to Eddy Isenberg and Ethan Rotenberg ...... for Producing the GREATEST CONCERT that I have ever EXPERIENCED..... this was not just a Show ! It was a Complete, Perfect , Overwhelming and Important Presentation of the most Significant and Esteemed Works by the Greatest Composers of the Musical Theatre World. ..... Ethan Rotenberg presented these Brilliant Compositions with such Skill, Arrangement and Talent. This was Joyous to watch. And the Incredible TALENT on Stage , Performing these Masterpieces with an Unprecedented Level of Musical and Vocal Excellence 😘😘😘😘😘. So much Beauty and DAZZLING Artistry. This was truly the EPIC, Exemplary CONCERT of all time. No words can properly convey the JOY and SPARKLE of this EXPERIENCE. ...... it was absolutely Stunning and Spectacular in every Showbusiness manner. Thank You Eddy and Ethan for Perfectly Demonstrating , in the Most Astounding way, that: there’s no business like show business. Every Person who Performed or Assisted in this Show, should Beam with the Pride of this Success. It was Breathtaking.

And another:

Last night, your Cruising Critic, Waldorf, and his intrepid companions, Janice and Rowlf, journeyed to Seaton Village for sustenance and entertainment. (Statler, alias Hugh Mosher, couldn’t join us, as he is currently warming himself in Αθήνα. You missed a great show, Statler, old buddy.)

Our first stop was Los Guaca-Moles for a delicious meal of authentic Mexican cuisine. I highly recommend this restaurant. The food is amazing, and the service very friendly and efficient. It is far better than the over-priced, pretentious, fancy-schmantzy, pseudo-Mexican places downtown.

Then a short drive to the 918 Bathurst Centre for the Impromptu Concert Series presentation of Broadway: The Early Years. Unlike my usual choices for entertainment, this was a concert, not a play – an absolutely great concert. Musical Direction (and that includes song choices, song allocation, vocal coaching, ego boosting, hand holding, etc., etc.) by the very talented Ethan Rotenberg, with Direction by the equally talented and versatile Eddy Isenberg. They managed to put together a killer lineup of talented singers! I can’t list them all, but I will single out a few of my standouts. 

The 2 comedy numbers were expertly delivered by Tanner Homonko (Be Like the Bluebird: Anything Goes by Cole Porter) and Jennifer Wren (To Keep My Love Alive: A Connecticut Yankee by Rogers and Hart). 

For tugging at our heartstrings, my favourites were Serena Hajee (Till There Was You: The Music Man by Meredith Wilson) and Matt Butler (Hey There: Pajama Game by Adler and Ross).

In a class of her own, Hailey Balaz (My Heart Belongs to Daddy: Leave It to Me! by Cole Porter).

And my absolute favourite of the evening, Mateo Lewis (She Loves Me: She Loves Me by Masteroff, Bock and Harnick). Talk about delivering a song…!
This was a really wonderful show! Unfortunately, last night was the last night.

Movie Music - Show 2


Ardavan Taraporewala,     Brayo Bryans,     Chantel Kuli,
Dante Toccacelli,     Dionisio Silva,     Gabriel Hudson,
Hailey Balaz,     Jennifer Wren,    Mathew Mac Lean,
Melanie Herbin,     Rosie Callaghan,     Serena Hajee
Suzette Newton - Janse van Rensburg,     Taryn Wichenko

For those who embrace or reject holiday music, this concert serves
the perfect mix of different and traditional holiday music. Enjoy our
talented company sing the most memorable music from all of cinema,
with a touch of great holiday classics for good measure!

Our Process



1 Solo Song

2-3 Full Group Songs


1-2 Solo Rehearsals - arranged individually

4 Group Rehearsals - 1 per week (most likely Tuesday or Thursday)

1 Full Run - TBD


Quick sound check in the space, and then we're on!

Artistic Staff


Artistic Director

Eddy has been involved in community theatre in Toronto for 40 years. He has worked many community theatre groups in over 60 shows, including  Scarborough Music Theatre, Scarborough Theatre Guild,  Curtain Call Players, North Toronto Players, Steppin' Out and, Encores By Encore. He has performed on stage in leading and supporting roles as well as  working behind the scenes as stage manager, producer and director.

Eddy is excited to be starting out on this new Impromptu adventure / partnership with Ethan Rotenberg as founding member..


Music Director

Ethan is thrilled to be a founding member of Impromptu Concert Series alongside Eddy Isenberg. Ethan is a Toronto-based music director, piano teacher, accompanist, and music copyist. He is a trained classical pianist and holds a bachelor in Drama from Queen's University. He also serves as associate music director for Nightwood Theatre's annual Lawyer Show, and is music librarian for symphRONica Jazz Ensemble. Previous credits include: Music Copyist - Dr. Silver (Musical Stage Co.), Associate Music Director - The Drowsy Chaperone, Legally Blonde (Nightwood Theatre), Collaborative Pianist - Songbook VI (Tapestry Opera), Music Director (No-Strings Theatre).





Impromtu Concert Series