A deep involvement with electro-acoustic approaches to music linked the pieces by the commissioned composers here, born between 1974 and 1980. “Li Po,” by the Mexican-born Enrico Chapela, had a circuitous genesis. He became enthralled with the writings of a Mexican poet, José Juan Tablada, who had long been immersed in the life and work of the Chinese poet Li Po. After recording himself reading a free Spanish translation of a Li Po poem, Mr. Chapela transcribed the phonetics of his recorded speech into musical sounds.