Paul McCartney, Dave Grohl, and a host of other famous musicians united to perform with New Orleans’ Preservation Hall Jazz Band to raise funds for their foundation.The ‘Round Midnight Preserves livestream event featured a mix of previously recorded footage and live shows, headed up by a rousing performance of ‘When the Saints Go Marching In’ – led by McCartney on trumpet.Irma Thomas, Dave Matthews, My Morning Jacket’s Jim James, and Nathaniel Rateliff also contributed to the rendition – watch