'Dear Summer: Volume 3' returns to highlight more emerging artists and DJs

Summer in Boston just got a new soundtrack: the third edition of its citywide mixtape. The City of Boston’s “Dear Summer Vol. 3” features a variety of genres representing neighborhoods across the city, including up-and-comers from the Berklee College of Music, local legends and artists with Boston roots who’ve received national attention. We speak to two of its co-producers.