A massive influence. Here's Morrissey himself on Sparks:
Morrissey On Sparks (From Under The Influence liner notes
"In a glorious surge of deserved success in 1974, the very comprehensive lyric sheets accompanying Sparks albums prove that Ron Mael is clearly driven to tell, yet he answers the media by skillfil Quietism and by impersonating various walls. Ron Mael is an undoubted genius, and where else would a true genius live but in the catacombs of hell? Ron asks his younger brother Russell to sing the words - in chilling falsetto. Russell sings in what appear to be French italics, and has less facial hair that Josephine Baker. It is a scream, because the songs are screams. (...) Who on earth would write a pop song in such a way? A song about an arts and crafts competition where 'lovely Claudine Jones/has to come to push her quilt', but where Tracy Wise gets a prize. There is no category for this madness - except the category of madness, and Sparks are only let down by their name. At 14, I want to live with these people, to be - at last! - in the company of creatures of my own species."