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Douglas , who was playing acoustic guitar in his father 's string band in the steel belt town of Warren , Ohio , first heard the Dobro played by " Josh " Graves when Graves was touring with Lester Flatt and Earl Scruggs . A testament to the maturing San Marcos club scene , this little pub is an ideal listening room an up-and-coming bands like the funk outfit we heard there on a weekday night . Other noteworthy features are the spatial separation of African aerosol sources into two distinct bands during the June-July-August season , a peak for Central American aerosol during the March-April-May fire season , and changes that occur over the Indian subcontinent and southeastern Asia over the course of the year . Most stars lie in a well-defined band in the HR diagram and the only parameter that determines where they lie is the star 's mass . The electron-hole pair formed when an incoming photon boosts an electron out of the valence band into the conduction band is called an exciton .