A kind of music that seems like it will go on forever? (4)

I believe the answer is:

soul

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'a kind of music' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

(Other definitions for soul that I've seen before include "Music genre; human spirit" , "Deep feeling - music genre" , "Spirit, inner self" , "Psyche" , "Glaser's partner" .)

I've seen this clue in The Irish Times.

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