"I once gave an informal concert at the phone company in Sacramento," he said.

For more than three decades, informal concerts were given in his music room.

He also began singing in informal concerts of Italian music.

Meantime, musicians were applying the word to informal concerts of folk music.

The ensemble began in 2005 when Nally and a group of friends sang an informal concert together.

It has become a venue for music events and informal concerts.

In recent centuries the building had served as a site for informal public concerts and lectures, with the offices used to house the Museum Authority.

He said that he would instead tour with an electronic keyboard around France to give informal concerts.

"I thought I'd make tonight's concert very informal," he said.

The group's first performance was an informal concert for a dozen people.