generate questions: The "soft" AC format has reinvented in the late 2000s/early 2010s as a result of its declining relevance, adopting a more upmarket, middle-of-the-road approach, with a selection of "oldies" (usually from the 1960s/70s onwards), primarily rock, jazz, R&B and pop music. Newer songs are more often (but not limited to) "easy listening" fare, this amount varying depending on the age of the station's target demographic.
Generally speaking, what is the earliest decade represented by the "oldies" on soft AC stations? {sep_token} Along with R&B, pop and rock, what genre of music is represented on modern soft AC stations? {sep_token} What genre of music do new songs on soft AC stations often belong to? {sep_token} During what period did soft AC stations attempt to reinvent themselves?