Smiles are sure to abound for SF audiences of Playing for Change as the musical extravaganza goes on tour this week with stops in LA, Seattle and New York. The multimedia, artist-driven effort is working to promote peace and music education through collaboration and live performances of world music. You can take in the tunes, including a rather irresistible rendition of “Stand By Me,” at Slim’s tonight. Should you miss the opportunity to see Grandpa Elliott, Mohammed Alidu, Jason Tamba of Afro Fiesta, and their counterparts performing together live for the first time, the film looks to be a promising second best (after showing at Tribeca, it won best song at the Roxbury Film Festival–no surprise there).