Quote:
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In recorded music, the terms A-side and B-side refer to the two sides of 7 inch vinyl records on which singles have been released since the 1950s. The terms have come to refer to the types of song conventionally placed on each side of the record, with the A-side being the featured song (the one that the record producer hopes will receive radio airplay and become a "hit"), while the B-side, or "flipside," is secondary.
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I got that from wikipedia.
Japanese artists usually can have two or more A-sides for a single, in Ayu's case H, A, &, fairyland c/w alterna, STEP you/is this LOVE?, and INSPIRE c/w GAME would all be examples of that. Although I'm sure that the first song on each of those singles was the most promoted.