As you know, I am in hospital without access to reference books, so what follows is just from memory.
Bacchus (English ˈbækəs) was the Roman god of revelry. Hence the Roman festival in his honour, the Bacchanalia (English ˌbækəˈneɪliə), and the common noun bacchanal ˌbækəˈnæl ‘a drunken revelry’. There is also the French equivalent, Bacchanale, (French bakanal, English ˌbækəˈnɑːl) a particular kind of musical composition.
...which the Classic FM chap called ˌbɑːxəˈnɑːl. Presumably he was thinking of Johann Sebastian Bach (German bax, English usually bɑːk or sometimes bɑːx), who has nothing to do with the case.