A Scratch Messiah, People's Messiah, Come Sing Messiah, Sing-it-yourself Messiah, Do-it-yourself Messiah (DIY Messiah), or Sing along Messiah (the first two British and Australian usage, the last three common in North America) is an informal performance of Handel's Messiah in which the audience serves as the unrehearsed chorus, often supported by a carefully prepared core group. Orchestra and soloists are usually professionals, though their services are often donated for charity benefits. The "scratch" name derives from the idea of cooking or building from scratch.