In music, "sharp keys" refer to key signatures that contain one or more sharp notes. Each sharp raises the pitch of a note by a half step. For example, the key of G major has one sharp, which is F#, while the key of D major has two sharps, F# and C#. Sharp keys are often used in various musical genres to create a brighter sound. Sharp keys are important for musicians as they indicate which notes should be played higher in pitch. Understanding sharp keys helps in reading sheet music and playing instruments like the piano or guitar. Musicians often practice scales in sharp keys to improve their skills and familiarity with different tonalities.