Chris Martin says he's 'gonna tear up'
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Summer outing kicks off July 10 in Portland, OR
The firm acting for guitarist plan to serve the band a writ at the ceremony
Musicians' meeting scrapped after snow causes transport problems
Singer reveals band are recording without him during solo set
Band to headline European event this July
Rock stars make announcement via Twitter
Katy Perry and Kenny Chesney will also play on the night
Katy Perry, MIA also featured on 2009 nominees compilation