Creating a function in PostGres

I'm trying to create a function in PostGres that'll return

SELECT l.artist AS aid, l.name, l.lyrics, a.artist FROM lyrics l, artist a WHERE a.id = l.artist AND l.id = $1

Where $1 is the id I insert...However, I can't figure out how to write the function. Currently I have...


CREATE FUNCTION getsong(text) RETURNS SETOF artist AS $$
SELECT l.artist AS aid, l.name, l.lyrics, a.artist FROM lyrics l, artist a WHERE a.id = l.artist AND l.id = $1
$$ LANGUAGE SQL;


I get an error that says the "Final SELECT returns too many columns."

Any ideas on fixing this?