http://youtu.be/_GX-PZNig70 This recently unearthed soundcheck from the Sex Pistols last show at Winterland in '78 surprised me, not only in terms of the sound quality but also the fact that a) I could actually hear the bass and b) Sid is actually (mostly) hitting the right notes during songs (the noodling around between songs doesn't really count). It's been a long accepted truism in rock circles (and here) that Sid just flailed away hopelessly and was there purely for the visual element, but at least by the end of the tour he seemed on his way to being a competent, if rather unexceptional, bass player. Note: Johnny does yell "Turn Sid down!" several times, but I think that's more because he's simply too loud in the monitors. Sid is definitely flubbing some notes now and then and just thumping the roots, but on the whole I was quite surprised how well he kept up, given his reputation.