PUTTING aside her recent collaborations with partner Francesco Turrisi, Rhiannon Giddens’ first solo album in six years arrives in mid-August. You’re The One NONESUCH is rooted in folk music, but filtered through her own uniquely diverse interests, with contributions from Turrisi, multi-instrumentalist Dirk Powell, bassist Jason Sypher, Congolese guitarist Niwel Tsumbu and producer Jack Splash’s band. Special guest is Jason Isbell. Expect to hear conga, Cajun and piano accordions, guitars, a Western string section and Miami horns. “I hope that people just hear American music,” says Giddens. “Blues, jazz, Cajun, country, gospel, and rock - it’s all there. I like to be where it meets organically.” On a more traditional tip, supergroup-of-sorts East Nash Grass issue Last Chance To Win MOUNTAIN FEVER that same week. The bluegrass sextet, comprising award-winning players…