KT TUNSTALL Tiger Suit [Virgin] When KT Tunstall burst into the limelight with 2006’s beatbox-driven hit “Black Horse and the Cherry Tree,” it was clear the Scottish singer-songwriter had a firm grounding in songcraft. On her third album, Tunstall leans toward a more adventurous set of electronic textures. Happily, instead of burying her songwriting under sheets of production, the broadened soundscape enhances and enriches her compositions....