NEW YORK (TCA/DPA) - In news that will be music to Rolling Stones fans' ears, legendary rocker Mick Jagger has struck a positive note in his first interview since undergoing a heart operation that postponed his rock group's tour.

"I'm feeling pretty good," Jagger said on the Toronto radio station Q107, according to Rolling Stone.

"Been rehearsing a lot lately in the last few weeks," he said, noting he had been to the gym that morning.

The Rolling Stones announced in late March that their summer tour across North America was being put on hold as Jagger received medical treatment.

Jagger, 75, also issued a statement at the time, apologising to fans and ensuring he would be "working very hard to be back on stage" soon.

Then in May, Jagger shared a video online showing him rehearsing his dance moves ahead of the upcoming tour.

He told Q107 in the new interview that he and his longtime bandmates are considering what songs to perform at this summer's shows.

"We're trying to pick some ones we haven't done in recent years, stuff we haven't done before," Jagger told the station.

"Most of the time people don't want too much unusual. People like a little bit unusual. They don't want 100 per cent unusual."

The rescheduled concert dates begin on June 21 in Chicago.