Influenced by '60s blues revival acts such as the Yardbirds and the Cream, Wishbone Ash was one of England's most admired hard rock acts of the early and mid '70s.  Playing a combination of progressive rock, blues, and jazz, the band stood out from other rockers of the day.  Originally named Empty Vessels and then Tanglewood, the London-based band was discovered by a young rock promoter named Miles Copeland.  After losing their guitarist, founding members Steve Upton and Martin Turner enlisted two guitar players, David Alan Turner and Andy Powell.  The dual guitar assault would give the band their signature sound as Turner and Powell's interwoven riffs danced gently above the tight rhythm section.  Now over 35 years later, Powell is keeping the group's namesake alive and well. Tonight, 7 p.m., all ages, $15-$17, Jazzbones, 2803 Sixth Ave., Tacoma, (253) 396-9169. - Tony Engelhart