The Rockport Chamber Music Festival certainly has brought a lot of Cape Ann to the Shalin Liu Performance Center stage this season. First, it was the world premiere of Charles Shadle’s piano trio “Dogtown Common,” performed on opening weekend. And now this Saturday, the festival welcomes back RCMF co-founder David Alpher with his own new work, “Between Twilights,” based on seven poems by Mardsen Hartley. IF YOU GO WHO: David Alpher WHERE: Rockport Chamber Music Festival, Shalin Liu Performance Center, 37 Main St., Rockport WHEN: Saturday, June 24, 8 p.m. Thursday, June 22, 8 p.m. Frank Huang, violin; David Requeiro, cello; Gilles Vonsattel, piano Naumburg Competition winners all, the trio performs works by Beethoven, Elliott Carter, Shostakovich and Tchaikovsky. $47-$65 Friday, June 23, 8 p.m. Lorelei Ensemble Director Beth Willer’s talented vocalists have made a mark. No repertory limits on these nine singers: from early to new, it all sounds great. Program—from Dufay to commissions by Gilbert, Shank and Bornfield—reflects their versatility. $29-$46 Saturday, June 24, 8 p.m. David Alpher, composer and piano; Robert Osborne, baritone; Stephanie Chase, violin; Sophie Shao, cello RCMF co-founder Alpher returns, with a world premiere, his setting of Marsden Hartley’s poems. Mozart and Schumann […]