THE BLUEBELLS (Sire EP):: U2 sans the wallof-emotion instrumental density, or Dexy’s Midnight Runners without the hokey Celtic-jig overtones, the Scot lads in the Bluebells have stripped pop down to barer bones than even the skeletal punks suspected. Bright, earnest folkrock (that doesn’t even dream psychedelia’s around the corner), songs with plenty of slots to insert messages of love & topicality. Shoulda known Elvis Costello would like this, enough even to add his trueblue production and voice to the Bluebells’ “Aim In Life.” As citizens of the U.K., the Bluebells gotta have some fashion gimmick, too, and theirs appears to be stylized work shirts (colorcoded, y’see), but pay that no mind, music’s good f nough to justify any cosmetic hijinx. R.R.