The Oscar Peterson discography is so immense that it's difficult to sort through the entries. If you're looking for a first purchase, "West Side Story" is a good pick, particularly if you are a fan of the original broadway or film soundtrack.
Piano playing seemed to come so easily for Peterson that at times on records I've had the feeling he's going through the paces. When he is at his best, though, he swings clean and hard and demonstrates he knows a tune inside and out. That is the case throughout this release. And he's not afraid to turn some of the tunes in different directions. For example, he steps up the tempo on "Tonight," a potentially risky move on an extremely romantic song, but the move works as Peterson, backed up by Ray Brown's steady bass and Ed Thigpen's tasteful drums, never falters.
On the other hand, the pianist does not shy away from the lyricism of "Somewhere," accenting the theme with ornate chording that mines the yearning and sadness that is at the heart of "West Side Story." And he finds a relaxed, loping gait on "Jet Song," a pace that for me captures the cheerful arrogance of the play's street gang.
Interpretations of "West Side Story" have been attempted before, most notably Dave Liebman's more experimental effort a few years back. For me, Peterson's approach is the more successful of the two in that I think he came closer to finding the pulse of the original work. This is a good addition to the mainstream section of your jazz piano collection.