* * * THE ORIGINAL SINS. "Big Soul." Bar/None. New records of '60s-style garage rock by young '80s bands are like Jerry Lewis telethons--they just keep on comin'. There is, of course, nothing new about this wonderfully cheesy genre that refuses to die, and the question of how to evaluate music that makes little or no claim to originality can be dealt with thus: Check the taste the group shows in influences, the imagination employed in blending said influences, and the amount of enthusiasm in their delivery. Pennsylvania quartet the Original Sins rates a perfect score in every category. Having worshiped at the alter of Love, the Velvet Underground, Syndicate of Sound, Canned Heat and Iggy Pop, they've learned their lessons well and come up with a debut LP that's lovably amateurish in spots, remarkably powerful in others and always fiercely sincere. A classic of its kind, this is young music guaranteed to push the nostalgia button in aging fans who remember the glory days of trash rock.