How do you apply music or songs into NFT? Can't they just record it or making another version from it? Just being curious 🤔

NFTs give you ownership but not rights. If you want the rights to the song you have to do it outside of NFTs via contracts, just like any other song that doesn't have an NFT. NFTs are like if you got a digital token saying you own the song. The people who own the rights can still do whatever they want. And unless you bought commercial rights to the song, you aren't allowed to use it for commercial purposes. It's like if you technically owned a horse but aren't allowed to ride it and anyone who races it can keep the proceeds.