The agency fought off strong competition to win the event, which it produced for the first time last year.
Around 8,000 guests are expected to attend the concert at Buile Hill Park on Saturday 12 September.
If it is deemed a success, ETTG's contract will be extended until 2011.
"As Salford steps up to become an international player in media circles with the launch of Media City, we are proud to be at the heart of the city, delivering an annual series of wonderful events to a huge national audience," said ETTG creative director Steve Smith.
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