David Keenan is a 23-year-old Irish folk songwriter with poetic lyrics who has been described as “not just another lad with an acoustic guitar; the sound of Tim Buckley and Brendan Behan arguing over a few jars, while Kavanagh deals Dylan a suspicious hand of cards, and Anthony Cronin and Jack Kerouac furiously try to scribble it all down.” If you like your folk music symbolically imbued with spiritualism with a dash of poetic mysticism in the vein of W.B. Yeats,  don’t miss Keenan’s performance tonight at the Iron Horse Music Hall (20 Center St.)  in Northampton at 7 p.m.  – Chris Goudreau