Speaking of Robin Williams and
Aladdin, he provided his own singing for the genie and he also voiced the merchant at the beginning. However, the merchant's singing voice was provided by someone else, Bruce Adler. Why didn't Williams also sing for the merchant? Or better yet, why not just let Adler do his speaking voice, too? He was, after all, a twice Tony-nominated actor.
Salve, Regina, Mater misericordiae
Vita, dulcedo, et spes nostra
Salve, Salve Regina
Ad te clamamus exsules filii Eva
Ad te suspiramus, gementes et flentes
O clemens O pia