Original sentence: The Miracles' hit "Shop Around" peaked nationally at #1 on the R&B charts in late 1960 and at #2 on the pop charts on, January 16, 1961 and established Motown as an independent company worthy of notice
Edited sentence: The Miracles' hit "Shop Around" peaked nationally at #1 on the R&B charts in late 1960 and at #2 on the Billboard pop charts on, January 16, 1961 (#1 Pop, Cashbox),  and established Motown as an independent company worthy of notice