NEW YORK (AP) — There are two ways to review “Buckingham Nicks,” the long-awaited digital reissue of the 1973, pre-Fleetwood Mac album by Lindsey Buckingham and Stevie Nicks, their only recording project as a duo. Imagine you had never heard of them, that they were an obscure 1970s act who made one album, broke up and left the business. You might think of “Buckingham Nicks” as a kind of period curiosity, a taste of vintage Los Angeles singer-songwriter pop, with its folkish stylings, well-crafted melodies and earnest sensibilities (“Do you always trust your first, initial feeling?/Special knowledge holds true, bears believing,” Nicks sings on “Crystal”).