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I'll give you a short and accurate answer.
There is no set rule to it.
And yes, album tracks can get their own PVs, eg. ANGEL'S SONG, Because of You
On most occasions the song as the A-side on a single gets one.
However, there are cases:
- Where an A-side doesn't get a PV.
- B-side gets a PV and A-side doesn't
- Some A sides on a single gets a PV but others doesn't.
- Album song getting a PV and a single not.
- A single without any PV
Anything's possible really.
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