Tower of Power’s Emilio Castillo reflects on “50 Years of Funk & Soul”

It’s been a couple years of celebrating “50 Years of Funk & Soul” for Tower of Power.

The brass-fueled group formed during 1968 in Oakland, Calif., and released its first album during 1970. The intervening years have seen a lot of music (18 studio albums, including last year’s “Step Up”) and more than five dozen members pass through its ranks.