In an era of big book advances — and little radio play — rockers like Neil Young and Pete Townshend are hitting the laptop harder than the studio. The wave of confessionals runs the gamut from high art to low pap. Add Young’s “Waging Heavy Peace’’ and Townshend’s “Who I Am’’ to the pile. Each has value — and flaws. How much you focus on the former and overlook the latter depends on how much you care about the music.
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