Music played a big part ofSNL's 40th anniversary festivities Sunday night, starting with Jimmy Fallon and Justin Timberlake openingsong-and-dance number, which channeled years of famous catchphrases and characters. Kanye West also performed a medley of tunes "Jesus Walks," "Only One" and "Wolves," while Martin Short and Maya Rudolph (as Beyonc) helmed a tribute to SNL'sbest musical-comedy moments,...