Possible Clues:

• The Specials' milieu
• Music for Mods and Skinheads
• ___ punk (The Mighty Mighty Bosstones' genre)
• Ray's missing note in music
• Music in standard keys always at the start
• Music genre of the English Beat and the Specials
• Genre invoked by many a 90's band
• See 17-Across
• Music from a Kingston trio?
• Voodoo Glow Skulls genre