There are discrepancies in the dates of the band line up. [http://prairiehome.publicradio.org/features/hodgepodge/25anniversary/list/p_powdermilk.html|This] is the most detailed source I've found, but it conflicts with other sources such as [http://prairiehome.publicradio.org/40th-anniversary/memories-through-the-decades/|this].
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house band on A Prairie Home Companion until 1980