Morissette offers a dose of comfort

In that light, Morissette's fiddling with the album seems less like an artistic risk than a retreat to her one unqualified hit, and Friday's performance at the Wang Theatre didn't offer much of a counterargument. Despite a handful of more recent songs such as ''Hands Clean" and the moody, minor-key ''Sister Blister," the show was billed as a celebration of the 10th anniversary of ''Pill," and Morissette played every one of its songs.

If all of this focus on a decade-old album suggested that Morissette's glory days are long gone, neither she nor the audience let on. Performing on a stage made to look like a well-used living room, the singer was relaxed and comfortable over her band's acoustic backing, though she occasionally experienced trouble making herself heard over the crowd's singing. She eventually stepped back and let the audience take entire verses and choruses of ''Ironic," though she made a point of taking back the song for the newly altered and Massachusetts-friendly line, ''It's meeting the man of my dreams / And then meeting his beautiful husband."

Morissette took a few other liberties with her songs, slowing down and changing the chords of ''Hand in My Pocket" and giving ''You Oughta Know" the same churning, unresolved feel of James Taylor's ''Fire and Rain." Mostly, though, the acoustic arrangements didn't drastically alter the material but simply offered a warmer and subtler spin on songs such as ''Head Over Feet" and ''Right Through You."

Opener Jason Mraz established the evening's acoustic bent, providing a busily rhythmic thrust to his clever songs and sounding like G. Love singing John Mayer. He and percussionist Toca Rivera joked around like best friends, but their clowning left room for only seven songs in their 40-minute set.