The Weakerthans and Constantines are together again and coming back to town as part of their Rolling Tundra national tour. (March 20 at the Palace. 8pm. Tickets $25/$30 available at all Ticketpro outlets, by phone at 1-888-311-9090 and online at www.sonicconcerts.com. 19 and over.) Ten-year vets The Weakerthans launch this tour on the heels of their fourth album Reunion Tour (which was short listed for the 2008 Polaris Prize). Toronto's Constantines recently released their fourth album Kensington Heights (on Arts & Crafts) showcasing their "artistic version of working man's rock 'n roll." Group singalongs of soaring choruses are a must.