Not from Glasgow, but you could try the Solid Rock Cafe, just round the corner, under the railway station, It shuts a lot earlier, but they do have a Circular Saw shape painkiller LP on the wall, which I'd swipe if I was that way inclined/could get away with it without being beaten to a BLOODY pulp (see sign on wall). Got drunk there last Friday.
I Surpose I should also plug this, one of my friends, friends is promoting Iconoclasm, a Metal band from Belgium, they are playing in "Oran Mor" (corner of Great Western Road & Byres Road)
This gig was surposed to happen on April 2nd but due to the drummer injurying his arm had to be cancelled. It is due to be re-sceduled but I have no idea forwhen, could be a while away.