^^ Holy Moly :O . I take he's talking about creditting Isaac Watts for "Joy to the World".
From Google it seems George Friederic Handel most likely did the source melody, while Lowell Mason arranged and adapted it using Isaac Watts's lyrics. So... dunno?
(
this interview indicates the arrangement was by all the soung guys, performance credits included in the album).
EDIT: random trivia, though listed at the end 3.14 is actually used in the game's intro, so it goes first. 1.01 is the title music.