I'm curious as well. 酒 ok ?? やきとりok 楽 ok other character ? it only seems 2 or 3 strokes to me under 山 none of the characters with that placement of 山 I find seem to make any sense. and you'd think it'd be a relatively common character if used in a sign.
the 山 is a *very* stylised 亠 with a lot of space before the two strokes underneath. I suppose even a stylised 山 would have a more distinct join between strokes 2 and 3.
and what does yakitori have to do with puppet shows? or vice versa? I didn't think Ueno was known for bunraku.
goes to show how you can lock on to a known shape.