If you want to know why it is that so many rippin' alt-country records come out of the unlikely town of Chicago, here's part of the reason. The Sundowners were scene fixtures in the Windy City for 30 years, holding regular court in a variety of beer joints and backing up the occasional celebrity that rolled through town. The live tracks, dating from 1961 to 1970 and representing for a reputed repertoire of 15,000 (!) songs, have the lo-fi ambience of those famous Bob Wills radio transcriptions. There are bum notes here and there, sure, but their triple-barreled hillbilly harmony rings true. LIVERPOOL TWANG The Beatles' ''Something'' gets recast here as a country shuffle, with bright guitar picking that would make late songwriter George Harrison smile in heaven.