The Orchestra of the League of Composers (ISCM) presented the group’s “season finale” at Miller Theatre on Monday June 7, 2010. True, this is a pickup orchestra, but you’d never know it from listening. Composer/conductor Lou Karchin confidently led the group through a wide stylistic range of pieces, including New York and World premieres. WNYC’s Jonathan Schaefer hosted, engaging the composers in brief interviews between the various pieces. D.J. Sparr’s piece DACCA:DECCA:GAFFA featured ace new music guitarists William Anderson and Oren Fader playing steel string acoustic instruments alongside the ensemble. The title referred to a set of chord progressions that