Several dates on the tour have been postponed after frontman Steven Tyler tore a muscle in his leg. Guitarist Brad Whitford sat out the initial dates on the tour after undergoing emergency surgery because he reportedly hit his head getting out of his Ferrari. Sccording to a press release, Whitford is expected to return to the stage when the band resumes the tour on Wednesday night. But now it's bass player Tom Hamilton's turn to call in sick.

Here is the official word from the Aerosmith camp: Aerosmith bassist Tom Hamilton will be sitting out some dates of the Aerosmith tour dates with special guests ZZ Top as he recuperates from non-invasive surgery. Filling in for Tom will be David Hull, a longtime friend of the band who played in the Joe Perry Project and who sat in for TOM on various shows in 2006.