The show was created by Jan Fleming, John Hoffman and Jim Jinkins, the latter of whom is also the creator of Doug.

On March 5, 2015, the whole series was released for viewing on Noggin's paid-subscription service from its initial launch.

She and her big brother Rondo, along with her best friend Lindi (a yellow dog), a pesky blue neighborhood cat named Riff and a green boy named Poco all try to learn about the world around them with the help of their neighborhood friends.

The series was music-based and included musically inspired characters named Lindi, Rondo, Riff, Poco, Reed, Miss Melody, Ellington, Encora, Sonata, Clef, Woofer, Aria, Tweeter, Flugie, Vi, and of course, Allegra the title character's name herself.

Over 100 original songs were created for the series, under the oversight of musical director Don Sebesky.