Recordings like Jeff Antoniuk's Brotherhood invariably make me think hard about what I mean when I use the term 'modern mainstream jazz.' In one sense, it's an okay (not great) term to use when describing jazz that isn't fusion (but could have some fusion-y leanings), isn't really avant garde (but often has some 'out' harmonies and ideas), is influenced largely by the classic bop and post-bop jazz of the 50s and 60s, and consists largely of the players' original compositions. Somehow, these sort