쓰다 is several verbs sharing a spelling, and the conditional -(으)면 here sits in front of most of them. The dominant one is "use": 라이브 밴드를 쓸 수 있으면 쓰자, 쓰고 싶으면 써요, 진짜. Others in these lines are spending money (5천억 달러 쓴다라고 얘기했으면 쓰겠지), saying a word (뭔가가 너무 맛있으면 쓰는 말이 있나요?), and wearing something on your head (나 귀 시려우면 쓸게). One line uses an old scolding idiom — 자네가 왔는데 그냥 있으면 쓰나, roughly "that won't do."