While your instincts may say so, not according to any one of the major style guides (AP, MLA, Chicago, NYT, APA, Columbia). An apostrophe is only added for possessives rather than plurals with acronyms, but a lot of people still add them erroneously. Most sources online will say “don’t do it but some people do by mistake.”
The OCs, (aka Osees, the Oh Sees, the O.C.s) are a lo-fi psych garage rock band with over a dozen albums. Their sound is unique, but could best be compared to other psychedelic and punk-influenced bands like Witch and Ty Segal.