A reunited Ben Folds Five made its much-anticipated return to Boston on Saturday night, playing a to a rabid, sold-out crowd at the House of Blues. The band’s nearly 2-hour set started out super-mid-tempo – and super-jazzy – before the trio let loose into a “rock block” to close out the main set. Drawing heavily from its new album, The Sound of the Life of the Mind, and its 1997 breakthrough Whatever and Ever Amen, the group also dipped into material from its self-titled debut but surprisingly avoided tracks from 1999’s The Unauthorized Biography of Reinhold Messner until re-emerging for a 3-song encore.