Black Pearl
As Oak O'Connor explains it, The Tallysmen + The Barbarians = Black Oak.  Or, perhaps more fittingly, "One Tallysmen, three Barbarians, one Viking and an uninhibited front man lead singer = one Heavy Metal Punk freak soul band called Black Pearl."  Members from the two classic Boston-area bands merged in 1967 and formed the group that was hailed as an early proponent of Heavy Metal.  O'Connor, drummer for The Tallysmen and Black Pearl, graciously provided some background information for 60sgaragebands.com, but a much more thorough history of Black Pearl is available on his website.
Black Pearl in Aspen, Colorado, 1968
Oak O'Connor Recalls Black Pearl

In Boston, I was in a band called The Tallysmen.  We played regularly around the city at college mixers and high school gym dances, notably Catholic Memorial High School in West Roxbury, which would be a packed gym every Friday night. We had the orchestra risers for my drums and the three mics lined up in front (like The Beatles, we thought). The staff let us do as we pleased more or less since we were bringing in a huge crowd. There were lots of girls I can tell you.

I moved into a loft on Columbus Ave with Nick Connolly who had just joined The Tallysmen as keyboards player. We lived above a tire shop at 310 Columbus Ave.; next door was a town house where three of The Barbarians lived: Bruce Benson, Geoff Morris and Jerry Causi.

The very bottom floor had a recording studio called The National Express Company run by Harry Miller. One day I asked Geoff if he wanted to jam.  He said no; that he got paid to play...but I kept after him and one day he said yes to get me off his back, I guess. When we started we didn't stop for an hour or so. It was improvisational rock and roll/R&B. We were having fun and soon we did like that everyday. Harry Miller even saw fit to record some of it. 

Black Pearl was formed in Boston to play a two-week gig in Aspen, Colorado that went over so well we stayed on at the club owner's invitation to be the house band the rest of the winter.  We were actually called The National Express Company until our first gig as opening act for Big Brother and The Holding Company with Janis Joplin. On the way to the gig, Bernie said we needed a better name. We were driving on Pearl Street in Denver.  Black Pearl!  OK!

Black Pearl included Bernie Champi, lead singer and songwriter; Geoff Morris, lead guitar (Barbarians); Jerry Causi, bass guitar (Barbarians); Bruce Benson, rhythm guitar (Barbarians); and Tom Mulcahy, rhythm guitar (Vikings). I, Oak O'Connor, played drums. We were an R&B band on LSD...hahaha--or Funky Freak Soul.  We were influenced by Barry and The Remains, The Lost, The Rolling Stones, The Beatles, James Brown, Ray Charles, Booker T., Howlin' Wolf, Robert Johnson, Sam and Dave, and Wilson Pickett.

We played as house band for about six months at The Avalon Ballroom in San Francisco opeing for anyone who came through there, including Steve Miller, Blue Cheer, John Mayall, The Greatful Dead, Doug Sam, and Big Mama Thorton., We also played at The Filmore, where we did a live recording. Down in Los Angeles we played at The Whisky and The Bank in Torrance (opening for Pink Floyd). The Cheetah in Venice was a great venue for large get togethers. We shared a bill with Ike and Tina, Chicago (then called CTA), Illinois Speed Press--the list is long.  We did a gig at the Anaheim Convention Center opening for Three Dog Night. The next week we signed with Atlantic Records. 

Murray Roman was an old friend of Lenny Bruce and he was writing for The Smothers Brothers Show at the time. He was a fan as we had met him in Aspen and even played some backup music on his comedy album, Blind Man's Movie. I think he got us the Lenny Brucemas gig but also it was L.A. Free Press event and we had been mentioned several times in that paper.

Don Fleischer was our first manager.  He owned restaurants in Aspen and a music store in Hollywood. He asked us to sign up with him and we did. Later we were managed by Larry Larson and Lee Weisel.

'Smokestack Lightning' was our show stopper and always got a standing ovation. We never released it or recorded it in the studio.

The Tallysmen in 1965