|The following is a list of characters in the Jack's Big Music Show series.
- Jack is the music-loving owner of a backyard clubhouse. He is puppeteered by David Rudman.
- Mary is Jack's best friend, who plays the accordion. She is puppeteered by Alice Dinnean.
- Mel is Jack's dog, who plays the drums. He is puppeteered by John Kennedy.
- The Schwartzman Quartet is a group of identical singers who visit the clubhouse often.
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