Article: 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. The format includes soul or disco artists such as ABBA, The Village People, The Jackson 5, Donna Summer, Tina Charles, Gloria Gaynor and the Bee Gees. Rhythmic oldies stations still exist today, but target African-Americans as opposed to a mass audience.

Now answer this question: What is the earliest decade of music typically featured on the rhythmic oldies format?
1960s