Christopher Trapani Horizontal Drift New Focus Records   Christopher Trapani’s latest portrait recording for New Focus features pieces for solo instruments, several with electronics. The composer’s work with microtones and hybrid tuning systems is spotlighted. Trapani has a compendious knowledge of microtonality, and he brings it to bear eloquently in the programmed pieces.   The album’s opener, Târgul, is written for vioara cu goarna, a Romanian variant on the stroh violin, a violin with an added horn to provide greater projection. It also can provide fascinating timbres, as Maximilian Haft’s performance illuminates. Dan Lippel plays the title track on