Maria Muldaur (opener for Grateful Dead)
July 21st, 1974
Hollywood, CA @ Hollywood Bowl
audience cassette master > reel (Rob Bertrando's Sony TC-152SD 
cm> Jerry Moore's 7" reel @ 7.5 ips, dolby nr) > 1st gen reel playback on 
Sony TC-850>Teac an-180 nr>sbm1>cdr>eac>cd wave>flac>CDR

01: chatter
02: Midnight At The Oasis
03: Any Old Time
04: Walking One And Only
05: Lover Man, Where Can You Be?
06: Intros
07: Tennessee Mountain Home
08: Take A Look At Yourself
09: Chauffeur Blues
10: I Can't Stand The Rain
11: Brickyard Blues
12: The Work Song
13: I'm A Woman
14: Nobody's Fault But Mine

John Kahn - bass
Paul Butterfield - guitar

Doubtful that Butterfield played guitar, it sounds like either Stephen Bruton or Amos Garrett and Butter would have played harmonica.  Also sounds like Geoff Gutcheon on piano.  So, by my guess, you have Maria backed up by either Bruton or Amos, with Gutcheon and Butter.