There's a lot of music having lyrics that seem engineered to be ignorable, making me think that the artist only intended them to be placeholders, either because

There's a lot of music having lyrics that seem engineered to be ignorable, making me think that the artist only intended them to be placeholders, either because they wanted the voice to be a freer instrument, or just because the genre format demanded lyrics. Aside from the obvious case of scat-singing, examples that come quickly to mind are Frank Zappa, Presidents of the USA, and Rob Zombie. I lot of the lyrics on King Crimson's Discipline seem to almost make it explicit that the lyrics themselves are an appendix. (I recall an interview with Zombie: someone asked him what some strange lyric was supposed to mean, and he replied something like "I don't know, it's just the song"). But it would be wrong, I think, to assert that instrumentals or lyrics for the sake of the voice are somehow on a higher plane. I think that being able to produce excellent melody and harmony as well as excellent lyrics, and to integrate them well, is the highest form.