Popa, are you saying that a band needs special written permission for each song they will play at a wedding?
No, there’s a b’feirush heter for performing other peoples music:
“(a) The exclusive rights of the owner of copyright in a sound recording are limited to the rights specified by clauses (1), (2), (3) and (6) of section 106, and do not include any right of performance under section 106 (4).” 17 USC 112(a)