Is it cheated to buy a semi-finished music for several hundred yuan?

Through QQ, I spent 600 yuan to buy a semi-finished music (music with everything but no words) online. He told me that I could upload it, but the music had to be signed. I asked him what else he needed to do, and he said that he only needed to transfer the money to him through QQ, and nothing else was needed. Excuse me, have I been cheated?