Folk Tunes, by Alan Gould; Salt, 2009, 80 pages, $24.95. Folk Tunes is one of the most enjoyable and intellectually engaging new volumes of verse I have read in recent years. It is Alan Gould’s most accomplished to date. Here we find the poet moving freely between light and serious verse and blurring the line between them, as the light carries the burden of the serious and the serious is relieved of its weight by its very sense of proportion and perspective. Whether serious or light, the poems in this volume are always consummately crafted, suggestive by turns of the…