This HIV-benefiting Olympic album, emphasizing global unity through a set of unlikely big-name collaborations, conveys an important message: unity can't be forced. This is best demonstrated by Moby and Public Enemy, neither of whom could have wanted their grating peace song to reach too many people, cuz they named it MKLVFKWR. Alice Cooper and Xzibit also fail to find a happy medium on Stand. But when Unity works, it really works, like the ambitious Herbert Groenemeyer, Cheb Mami and George Dalaras song Everlasting, the more straightforward Destiny's Child and will.I.am track I Know, and the sweeping By Your Side by Timbaland, Kiley Dean and Utada. The worst is Avril Lavigne's bloodless rendering of Dylan's Knockin' On Heaven's Door, which first appeared on last year's War Child comp. Recycling a recycled song from one benefit album to another? That's just wrong.