What is the musical form for a piecenof music with two alternating sections section a and section b?

i came across this and i found it funny that when you're bored you play hangman on so im going to guess a : )

in contrast to the other bands specifically the hardcore punk bands of the period, the music then of the replacements were then more of a melodic. the replacements were an american band in 1979 formed in the minneapolis, minnesota.hope this .