This is what Rolling Stone Online had to say about Metallica's performance at The Bridge School Benefit Concert. I've seen clips, I don't agree, and neither does anyone who went but oh well.
"...
Expectations ran high for the night's closer, Metallica, and aside from their opening number, the tuneful new song "Low Man's Lyric," the band fell short of them. More accustomed to performing in front of staged pyrotechnics than children, Metallica looked uncomfortable and had trouble filling the sonic gaps they usually bury in layers of distortion. The group recruited Alice in Chains guitarist Jerry Cantrell to join them in an embarrassing, by-the-numbers version of Lynyrd Skynryd's "Tuesday's Gone," that inspired many in attendance to follow Tuesday's lead and head toward the parking lot.
..."