Singer-guitarist Sam Getz was a session guy before joining singer-songwriter Kate Voegele for her 2006 tour. After four years on the road with her, he hen hooked up with indie rockers Stephen Kellogg & the Sixers and toured with them for three years. That band took a hiatus a few years back and Getz put together Welshly Arms. The blues rock act has become a huge success, and the band plays House of Blues tonight at 7.