The improvised, a slapdash, slipshod ladida of this and that (but fantastically choosy), touches on an ephemeral impulse and dangles with it.

Improvisation snatches the silt de jour and makes it dance to its own peculiar melody. It moves by practiced instinct, making use of what is new to both hand and eye. It is by nature receptive, responsive to ambiance and the most slender of slopes or proclivities.

Who improvises often?
John Coltrane.
Herbie Hancock.
Charlie Parker.
Santana.