Producer-songwriter-performer Eric Ambel (a.k.a. Roscoe) embodies the New York City-based subgenres that have been clumsily labeled ''cowpunk'' and ''country-fied'' R&B. No surprise, then, that his exhilarating second solo album Loud & Lonesome evokes Texas via the Lower East Side, on the strength of rough-hewn stylings and achy ballads. A-

