The story itself is interesting (although you'd have to see the show to get all the details – trip to broadway, anyone?) and the lyrics reflect this – being both clever and making sure you keep up with what's going on! My favourite tracks are 'The Wizard and I', 'Popular' and 'Defying Gravity'.
Even if you don't think you like musicals, I would throughly reccommend this – I think it has something for everyone, and isn't your stereotypical cheesy jazz-hands show (it's about a wicked witch for a start!) Plus once you hear even one track, it will be stuck in your head for days so you'll have to buy it!