Experimental type of music regenerated wife on avenue (3,4)
I believe the answer is:
new wave
'experimental type of music' is the definition.
'regenerated wife on avenue' is the wordplay.
'regenerated' becomes 'new'.
'wife' becomes 'w'.
'on' says to put letters next to each other.
'avenue' becomes 'ave'.
'new'+'w'+'ave'='NEW WAVE'
(Other definitions for new wave that I've seen before include "Style of rock music deriving from punk" , "1970s rock style" .)