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In page Sun Ra:

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Sun Ra became a fixture in Philadelphia, appearing semi-regularly on WXPN radio, giving lectures to community groups, or visiting the city's libraries. In the mid-1970s, the Arkestra sometimes played free Saturday afternoon concerts in a Germantown park near their home. At their mid-1970s shows in Philadelphia nightclubs, someone stood at the back of the room, selling stacks of unmarked LPs in plain white sleeves, pressed from recordings of the band's live performances.[citation needed]