I didn't know Los Lobos was playing til just now.  I'll admit I'm not a blues fan.  I'd say Los Lobos is the most appealing act for me since several years ago when Blues Traveler did a Sunday night spot and I actually went down.  My step-son loved their song "Hook."  The sound was disappointing, there, that day though and I don't think I've been to blues fest since.  I'm assuming some of the PA problems have been fixed by the recent landscaping and stage work in the park.  

Best Los Lobos song (to me) is "Will The Wolf Survive?"  Most popular Los Lobos song? Probably their cover of "La Bamba" from the bio-pic of Richie Valens starring Lou Diamond Phillips (1987?).  Valens played one of his last shows in Duluth at the Historic Armory in 1959.  I bet they play it in Duluth.  And wish I could be there for it.  A little DJ nerdery: Singles in the 50s and 60s were usually 2 minutes or less, due to some conspiracy way beyond the scope of this post.  But by the 80s top - 40 radio had settled on more like 4 minutes as a uniform length. Los Lobos released 2 versions of "La Bamba" one true to the original, one longer one.  In the full length version of Los Lobos' "La Bamba" there is a 60 second or so outtro that showcases some brilliant latin/mariachi style guitar work that hearkens back to the song's Mexican folk roots. So I actually like that version better than Richie Valens for that reason.  

Ok ... enough meandering for now.  Hope everyone has a great time!