While the Denver Botanic Gardens' summer concert series is a decades-old tradition, Swallow Hill, which took over booking, producing and promoting the concerts there in 2010, has helped turn the series — which also includes a few shows a year at the DBG's Chatfield location — into a universally sold-out affair. The 2015 series boasted a wildly diverse lineup that included local legendary bluegrass outfit Hot Rize, Jazz at Lincoln Center Orchestra with Wynton Marsalis, Boz Scaggs, Bruce Hornsby & the Noisemakers, Culture Club, Melissa Etheridge, Ziggy Marley, Gipsy Kings, and a stop on Orquesta Buena Vista Social Club's final tour.