>>>Found an even weirder example. Lyrics of the last song on Uriah Heep's album "Demons and wizards" - "The spell":
>>>
>>>What do you think I am
>>>Do you think I'm dreaming
>>>
>>>Now what is the meaning of "what" in this case? Surely it's not a request for identification.
>>
>>You're looking to rock music for grammatical merit?
>
>Sure. Are you saying that these guys invented it by themselves? I'm not giving them that much credit :).

What difference does it make? Rock lyrics are not intended to be lessons in grammar. If someone uses language badly, and such language is adopted by rock lyricists, it's just lousy language usage, not something that needs to be dissected and parsed for grammatic accuracy.

>I'm rather convinced they lifted it from somewhere, therefore I'm assuming such usage existed before and elsewhere. This is just where I've found a copy of it.