Alvin and the Chipmunks is a 2007 American live-action/computer animated musical comedy film directed by Tim Hill.

The story is about three singing chipmunks who find success in the music industry, but when an evil music executive tries to exploit them, they must find a way back home to their friends. Alvin, Simon, and Theodore are three mild-mannered chipmunks who live a carefree life... until one day, their tree is chopped down and taken to the big city: Los Angeles. They meet Dave Seville, a songwriter down on his luck after being rejected by his former best friend, big shot record executive Ian Hawke. They follow him, and Dave stumbles into the room on them singing in perfect harmony.

More Info: en.wikipedia.org