Ideally, musicians recording Tiny Desk (home) concerts adhere to the series’ core concept and perform behind some sort of desk, tiny or otherwise. But, barring that, it helps to make bookshelves your backdrop. When Aoife O’Donovan assembled her band at Portsmouth Book & Bar in Portsmouth, N.H., she made sure to note her surroundings: “It’s great to be here, surrounded by all these books.” The Bostonian singer-songwriter, who these days splits her time between a solo career and her work with the Grammy-winning supergroup I’m With Her, has a sound nicely suited for bookish locales: O’Donovan’s warm folk-pop music conjures memories of the Northeast folk boom of the ’90s, the soaring plaintiveness of Indigo Girls and the winsome lilt of modern bluegrass, elevated by a voice that’s searching and friendly.