An adaptation is a musical work, which uses elements (music or lyrics) from another musical work.
Partial adaptations
A partial adaptation is a musical work which integrates only a part of another musical work, and this part is only a fragment of the new musical work.
Crazy Train
written by Ozzy Osbourne, Randy Rhoads, Bob Daisley
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Let's Go
written by Twista, Trick Daddy, Lil' Jon, Big D., Maurice Marshall, Jim Jonsin, Charles Young
English
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Party Like a Rockstar
written by Demetrius "Meany" Hardin, Rasheed "Sheed" Hightower, Jason Pittman, Richard "Fat" Stephens, Brian "Bingo" Ward, Billy Hume
English
— based on two guitar riffs from the original