ソウ, かな.でる, すすむ
play music, speak to a ruler, complete
JLPT1 G6 S9 F1067
The relevant seal inscription form is 廾 (pair of hands) + an element# representing a skinned, sacrificial animal the limbs of which are gathered together → *offer*/*present* a sacrificial animal → *report*; *play an instrument* (← offer a report/recital).
[Full Kanji Etymology List]