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These days, Will Smith’s usual summer contribution is a box-office blockbuster, but back in 1991 — when he was still the Fresh Prince — he paired with DJ Jazzy Jeff to release “Summertime.” The rap is endearingly simple — chasing girls, hitting up barbecues and cruising around in cars. “Summer, summer, summertime/ Time to sit back and unwind.” The season doesn’t need to get any more complicated than that.