Neither can sing live (or on album for that matter). That's alright, though. I enjoy Trent Reznor's music, though I'll be the first to say I wish I could unhear his live performance. Regardless of what you believe, neither Kesha nor Gaga are Artists: they do not write or compose their music. They aren't any different than any studio produced boy-band. The only thing that sells is their "crazy" image. Lyrical composition and song structure is similar. The comparisons are valid (except of course the comparisons these two stars make of their music to ACTUAL artists). Neither will exist as a blip in anyones memory 10 years from now.