There's also the fact that for example in rock the singer is not singing the entire song. And even if they are, the songs can still be complex. Think he's already been brought up in here, but look at Frank Zappa. He was certainly making complex music, but there's lyrics in his songs. Or you could look at, for example, scat. The voice is used as a primary instrument rather than to deliver lyrics. I think there should definitely be a distinction made here between a song with vocals, and a song with lyrics. Because your voice is really just another available instrument.
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