album_presenter.description.discover album_name=Improvisation: Its Nature and Practice in Music, artist_name=Derek Bailey, records_count=0, countries_count=0, countries=, media=, year_range=album_presenter.description.releases album_name=Improvisation: Its Nature and Practice in Music, artist_name=Derek Bailey, records_count=0, countries_count=0, countries=, media=, year_range=