Source of songs, perhaps -- river birds (7)
I believe the answer is:
deejays
'source of songs' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'river birds' is the wordplay.
'river' becomes 'dee' (River Dee).
'birds' becomes 'jays' (I've seen this in another clue).
'dee'+'jays'='DEEJAYS'
'perhaps' is the link.
Can you help me to learn more?
(Other definitions for deejays that I've seen before include "Players of records" , "Colloquial disk jockeys" .)