I want to know the answer to the following question:
What is the earliest decade of music typically featured on the rhythmic oldies format?
All the background I'm provided with is that "A more elaborate form of urban AC is the rhythmic oldies format, which focuses primarily on "old school" R&B and soul hits from the 1960s to the 1990s, including Motown and disco hits.". Is that enough to answer the question?