He might be best known in rock circles as a founding member of the Spin Doctors, but Aaron Comess has long ran on a parallel course focusing on jazz and blues — collaborating with Brad Meldau, Roy Hargrove and Robert Glasper along the way.

True Nature couldn’t have picked a more appropriate title for its new EP, even if the group — led by Lou Barlow — doesn’t start off taking its own advice.

If you last heard one-hit-wonder Joan Osborne doing “One of Us” in the 1990s, a turn to the blues likely comes as a shock. But time has weathered her voice in the best of ways, and her abiding passion for these soulful sides did the rest.

You remember the Spin Doctors, right? A group of shaggy hairs who shot to superstardom as part of the whole tie-dyed H.O.R.D.E. of neohippies making fun-rock back in the 1990s.

If “Past, Present and Future” from drummer/composer Aaron Comess, a founding member of the Grammy-nominated, 10-million album-selling Spin Doctors, sounds like two people talking at once, that’s kind of the point.