Mark has always appeared extremely jovial in Pavement videos, except for maybe Preston School Of Industry video. And that band has always seemed more lighthearted and cartoony compared to Sonic Youth's violent for lack a better word, esotericism. From what I can tell from videos, and that's all I have, Mark still seems to be enjoying himself, albeit slightly out of his element. I'm sure there was a bit of a adjustment period there when he first joined. He's still great though, Ibold rules.
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