Whitesnake

See the performance.

Singer David Coverdale is reportedly seeking treatment for a "persistent upper respiratory infection."

Decision follows dropping of several shows for various “health challenges.”

Band members have faced various health woes while on their farewell tour.

Guitar virtuoso played on band's 1989 album 'Slip of the Tongue.'

The band's other guitarist had to cover solos for him.

The Darkness frontman says experience made him “vomit in my mouth – in a really good way.”

It wasn't until guitarist John Sykes added his "embellishments" that Coverdale realized it could be a Whitesnake song.

Singer says he's retiring from the road once this trek is over.

Trek will also feature Swedish rockers Thundermother.