I figured this was best answered in this forum... What is your definition of 'straight ahead' (as in 'straight ahead jazz')? I can't quite put my finger on it, but it seems to me that it's acoustic jazz played by a small group and not extremely experimental. I don't know how to describe it better? You can't say it's standards ... I have heard people describe their colleagues' music as 'straight ahead' but it was all original. I'm sitting here listening to Jim Hall's 'Concierto' and was wondering 'is this straight ahead'? I say yes.