For sensitive songwriters Vic Chesnutt, Mark Eitzel (American Music Club), David Bazan (Pedro the Lion), and Will Johnson (Centro-Matic) the bad times are never more than one strained sigh away. "Mopey" isn't the right term to describe them--they're all too literate, learned, and classy for such a tag--but some synonym of "depressing" still definitely applies. For this tour as the Undertow Orchestra, they'll take turns backing one another on songs from their own projects. Johnson will be performing material from Centro-Matic's next album, Fort Recovery (Misra), due out in March; the Texan is the least well-known of this group, but his rambling indie-kid country is just as steady and beguiling as anything the other three have done. Centro-Matic's Scott Danbom will pitch in on piano and violin. This show is part of the Hawk Winter Music Festival; see page 36 for a complete schedule. 2/17, 9 PM, Park West, 322 W. Armitage, 773-929-5959 or 312-559-1212, $16, 18+.