One type of music, southern soul (3)
I believe the answer is:
ska
'one type of music' is the definition.
'southern soul' is the wordplay.
'southern' becomes 's' (abbreviation).
'soul' becomes 'ka' (term for the soul in ancient Egypt).
's'+'ka'='SKA'
(Other definitions for ska that I've seen before include "Dancehall music" , "Noted genre" , "popular music" , "Jamaican music, forerunner of reggae" , "Music genre" .)