A-side 
noun
The side of a pop single regarded as the main one.The double A-side single Young Man is currently out on promo....
- I wanted to make an album that didn't have any throw away tracks on it… where every piece is a potential A-side single.
- I also like the idea of recording songs in pairs and putting them out as double A-sides.
- provincialship
- proving ground
- Provins
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- provirus
- provision
- provisional
- provisional callus
- provisional driving licence
- provisional driving license
- provisional government
- Provisional I.R.A
- provisionality
- provisional licence
- provisional license
- provisionally
- provisionalness
- provisional order
- provisionary
- provisioner
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- provisionless
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- proviso
- provisor