I don't like my boyfriend's music, how can I be honest?

My boyfriend loves to make all kinds of music, It's a huge part of his life. He raps, he sings, and most recently, he screams (hardcore/screamo). He is just really bad and I don't know how to tell him... He will text me lyrics and ask what I think, he writes songs and sings them for me... He gets insecure and will ask me if I think it sounds good. I have been lying saying "yea you're good", then it seems like he doesn't believe me, so I will say, "I liked the part where you said (blah blah blah)" ...all lies! How can I fix this? I have a feeling its kind of over... but what should I have done? I don't think I could tell him I honestly I don't like any of it... he is really sensitive.
I don't like my boyfriend's music, how can I be honest?
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