If you translate this literally into Korean, "I can't wait" would be 못 기다려요 or 기다릴 수 없어요. But... this is just my guess as a fellow learner, but I feel like you should not translate this literally into Korean. In English, if you say you can't wait, it means something positive (like, "I'm so excited to do x that waiting is difficult"). But if you say 못 기다려요 or 기다릴 수 없어요 in Korean, I feel like Koreans might ask you, 왜 못 기다려요 (why can't you wait)? In Korean, it sounds like you are saying you actually can't wait (because there's no real reason you can't wait for the song, right? It's just how you feel. It's not like you're going deaf or something). For this kind of feeling, I think it would be more natural in Korean to say 기대돼요 (I'm looking forward to it) or maybe 빨리 나왔으면 좋겠어요 (I hope it happens quickly/early).