You're at a gig or practice session and your guitarist is playing a song in the key of C, but you only know it in the key of G. Enter Key Transposer. Key Transposer helps you transpose the keys of music. It offers a simple interface and has support for 15 keys. The Keys are: C MAJOR G MAJOR D MAJOR A MAJOR E MAJOR B MAJOR F# MAJOR C# MAJOR F MAJOR Bb MAJOR Eb MAJOR Ab MAJOR Db MAJOR Gb MAJOR Cb MAJOR G# MAJOR D# MAJOR A# MAJOR You could also use the as a study Guide to learn Chords and improve your music theory knowledge.Whether you play piano,guitar,or another instrument knowing how to transpose your chords is essential.