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If your wanting a music game, your choices are between Guitar Hero and Rock Band really, and in many ways, Rock Band wins. This game pretty much filled in the gaps that Guitar Hero didn't do.
First ill start with the gameplay, as single player you start a band and go to gigs to earn fans and money to help make your character cooler. Which beats just playing songs for the sake of it like Guitar Hero does. Everything looks more sharper and cooler whilst playing the songs too. Also, wanting some friends round? Simply make a band with them and take a tour with them.
The instruments, I must be honest, they're good, but not as good as Guitar Hero's new ones. Rock Band's guitar, is nice and quiet, but seems a little stiff. The drums, are loud and fun to play, but are missing the cymbals (experienced drummers seem to snap the bass pedal and break the skins). The microphone is great however, but vocals can be done down Microsoft's headsets which aren't as good. Another problem is that everything is wired.
Extra things that are good are downloadable content, all songs downloaded can be transferred onto Rock Band 2! Even played on Rock Band 2s story mode! Rock Band has a great song list too, that beats Guitar Hero's list. Another great thing is, instruments from Guitar Hero are usable on Rock Band (except new drums from GH4).
If your wanting a nice set with an amazing game, id recommend Rock Band 2. If you want cooler instruments with a less interesting game, take Guitar Hero 4.