Improvisation is an important part of musical performance, and it involves creating music spontaneously without any prior preparation. JAMS, scats, and VAMPS are all forms of improvisation. JAMS involve musicians playing together in an informal setting, often with a focus on improvisation. Scats involve vocal improvisation, usually with a jazz influence. VAMPS involve repeating a short musical phrase or chord progression to create a musical foundation for improvisation. All three of these techniques can be used to create improvised music.