Local rockers 15 60 75 (The Numbers Band) have pursued a singular vision of blues, rock and jazz for 50 years, and they continue to maintain a busy live schedule and to write new material. To celebrate its fiftieth anniversary, the band will perform tonight at the Kent Stage and at 8 p.m. on Saturday, March 14, at the Beachland Ballroom. Kidney has recorded and toured with Anton Fier and his Golden Palominos. He and his brother Jack have toured Holland twice and played in London. The entire band went to London to perform at the Royal Festival Hall in 2000. At tonight's show, ticket holders will have exclusive opportunity to purchase the new Numbers Band release, Endure: Outliers on Water Street. The release date of the album is still to be determined. (Niesel)