Improvised musically is a term used to describe music that is created spontaneously and without any prior preparation. VAMPED (6 letters) is a term used to describe a repeating musical phrase or pattern, usually played on the guitar or keyboard. Riffed (6 letters) is a term used to describe a short, catchy musical phrase that is repeated throughout a song. Both vamping and riffing are common techniques used in improvised music.