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Jamming on some blues and improvising on some rock and blues. im·prov·i·sa·tion/imˌprävəˈzāSH(ə)n/noun

1. the action of improvising."she specializes in improvisation on the piano"synonyms:extemporization, ad-libbing, spontaneity, lack of premeditation; rareautoschediasm"some of the best things in the film came out of improvisation"
   • something that is improvised, especially a piece of music, drama, etc., created without preparation.plural noun: improvisations"free-form jazz improvisations"