What are all of the skits Will Ferrell has done on Saturday Night Live?

Im trying to find a certain skit he did that was mentioned on Late Night with Jimmy Fallon of Will Ferrell doing a comedy skit I believe that was on SNL of him leaving a answering machine message with kids singing Happy Birthday but they keep messing up. Does anyone know where I can find a list of all his skits on SNL? I cant seem to find a straight up list. :) Thanks