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A-side usually refers to the single that is promoted and played on the radio or (sometimes) the only song on the single that is made into a PV.
Example: Amuro Namie's single "WANT ME, WANT ME". WM, WM is the A-side song and "Handle Me" is the B-side song.
Sometimes a single will be double A-side like w/ Amuro Namie's "GIRL TALK/the SPEED STAR". Both songs recieved radio play and both also had PVs.
Also, alot of the time B-side songs aren't present on the artist's studio albums. But like Halla said, there's not really much a difference.
Is that what you were asking?
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