Eric
It's words and music. gotta have both. you need vocals to convey the emotion of the music. Singing someone else's lyrics
is just going through the motions. Lyrics are very personal, Writing lyrics about something you've experienced and being able to connect with the listener- thats magic. Listen to Jeff Beck
on "Cause We've Ended As Lovers" he doesn't need a singer; he lets his guitar do the talking- magic again.