I have a really hard time defining what I call "real music." It's one of those things I don't think I can really describe, it's just something I hear. It's incredibly rare for me to deem any kind of rock - or anything else mainstream for that matter - as real music. I look for really lush sounds: a lot of instruments (a world of music exists outside of guitar, bass, and drums, people), genuine motive behind the music, actual talent. Lyrics and vocals are never necessary, and I would actually prefer they're avoided unless you know what you're doing.

I guess essentially, most of what I call "real music" are instrumental pieces, and the few mainstream musicians that try to bring something new to the market. Express yourself, but don't forget to express your individuality as well.