Heartfelt, extremely distinctive collection of songs (4)
I believe the answer is:
deep
'heartfelt' is the definition.
(I've seen this in another clue)
'extremely distinctive collection of songs' is the wordplay.
'extremely' suggests removing the centre (only the extremes of the word are used).
'collection of songs' becomes 'EP' (Extended Play record).
'distinctive' with its middle taken out is 'de'.
'de'+'ep'='DEEP'
(Other definitions for deep that I've seen before include "Profound - engrossed" , "Bottomless" , "Wise - difficult to understand" , "hard to follow" , "hard to understand" .)