Celebrating their 40th year, British punk legends G.B.H. is touring in support of their 12th studio album, Momentum, released last November but still racking up spins and accolades virtually every place the tracks appear online. Colin Abrahall, Jock Blyth, and Ross Lomas, the three founding members, have lost none of the fire and brimstone that erupted all over their debut album, City Baby Attacked by Rats. They’re such a solid, seasoned unit that all five of their post-1996 albums feature current drummer Scott Preese (Bomb Disneyland/Bomb Everything), who’ll man the kit when they play the Observatory North Park on May 24. The bill includes Golden Hill’s Authentic Sellout, who just released a video for their newest track, “Radiate,” Lemon Grove punk rockers the Widows, and Fireburn.