"Oh Kay" is amazing not only for the number of classic standards it introduced (including "Someone to Watch Over Me", "Do Do Do" and "Clap Yo' Hands"), but also for the greatness of it's less well known numbers (such as the bouncy "Oh Me Oh My!"). The songs are pure 1920's fun, and have a lot of syncopated beats that may be difficult to play unless you've heard the songs first. The sheet music is standard Broadway stuff, and is playable at the intermediate/advanced level. The piano accompaniment basically follows the vocal line, which is helpful as well. This comes highly recommended, and buy the "Oh Kay" CD while you're at it -- it's great as well.