Original Sin (subtitled Music for Ballet Composed by John Lewis) is an album in the third stream genre composed by John Lewis recorded for the Atlantic label in 1961.

[1] The contemporaneous DownBeat reviewer criticised the sound balance on the opening track – "it very rapidly becomes a concerto for cymbal and small band" – and condemned the inconsistency of the music: "The first variation of Part 2 is unabridged musical comedy pit band.

But the tantalizing thing is that Variation 2 is a clever, self-sustaining, unified, and original little composition.

Variation 3 sounds like a fashion show, but Variation 4 is a lovely, light, unpretentious piece, and Variation 5 is simple, stark, and well composed[,] reminiscent of Aaron Copland at his best.

"[3] AllMusic awarded the album 2 stars.