For the last decade, trailblazing alternative rock figurehead Tanya Donelly — co-founder of Belly, Throwing Muses and The Breeders — has pursued meaningful collaborations with favorite artists and friends. The resulting work is by turns poignant, delightful and entirely surprising, melding folk, rock, pop and orchestral sounds. Her latest, The Loyal Seas, pairs Donelly with New England cult-favorite Brian Sullivan, who’s worked under the moniker Dylan in the Movies since the mid ’00s. A skilled singer, songwriter and multi-instrumentalist, Sullivan’s debut, Feel the Pull (2005), and follow-up full-length, Sweet Rebel Thee (2014), are each teeming with a lush, discrete form of alt-pop, Sullivan’s private mind garden translated as cinematic vignettes. The Loyal Seas full-length debut “Strange Mornings In the Garden” is a rare gem featuring 10 perfectly crafted songs--from luxuriant, sweeping ballads to tightly-knit, kinetic alt-pop.