The 1986 compilation that introduced Cocteau Twins to American listeners tantalizingly highlights the tensions that define the UK group’s early work; it’s equally eye-opening for both newcomers and longtime fans. Pummeling drum machine and ringing sheets of guitar give “Wax and Wane” its ominous, gothic edge; the swirling “From the Flagstones” suggests the more dulcet developments in the band’s future. Then there’s “Lorelei,” which pairs Elizabeth Fraser’s heavenly voice with blindingly bright guitars and bells—a vision of pop at its most divine.