Singer-songwriter Alaska Reid has decided to adopt the band name Alyeska, but the teenaged singer-guitarist is still the writer behind the trio’s beyond-their-years folk-rock. Reid, who hails from Livingston, Mont., and is now based in L.A., deals in raw, forthright confessionals that sound like they could have been birthed in a Laurel Canyon backyard back in the day. Notable, though, is Reid’s sense of self-awareness: “Honest, I’m too young to reminisce,” she sings in “Honest.” The new EP “Alyeska,” recorded at Sunset Sound, is more ambitious than the “Powerlines” EP that Reid released under her own name; hers is a developing story well worth following.