Compilations from the folks at KRS have come to resemble intergenerational, geographically indifferent mixers. If the label likes you, you're in, regardless of who you're signed with, where you make your home or how many times your name appears in Google searches. The label's latest assemblage, the 43-track "Tracks and Fields" suggests that perhaps it's time to start weeding down the guest list a bit. Sure, old-timers Superchunk almost seem indispensable again with the muscular pop stomp of "Everyone Gets Crushed" and relative newcomers the Lovers turn in a Cyndi Lauper-ish heartbreaker called "Birds in the Sky." But for every artist that shines (Male Slut, Cynthia Dall, Shoplifting), there's a clunker from the likes of Gas Huffer or Radio Berlin that'll have you reducing and reshuffling "Tracks and Fields" into a single CD-R faster than you can say "What, no Sleater-Kinney?"