You may not have heard of them yet, but local rock ’n’ rollers Offset Season are climbing the ladder of the local music scene. At their June 23 show at the House of Blues, they started with the catchy harmonies and upbeat piano of their new song, “Trans-Atlantic Love.” Before the girls in the crowd were finished screaming, the five guys (plus visiting trumpeter Zac Curtis) got them moving to the beat by playing “Santa Barbara” and “Run,” songs saturated with brass and harmonica. By the end of their set, it was evident why fans love this group of talented musicians. Catch them again at the House of Blues on July 28, for the release of their five-song EP.