to be on tour
The Spanish phrase 'estar de gira' translates to 'to be on tour' in English. It is often used to describe the action of travelling from place to place, usually for performances, similar to a musician, theatre troupe or sports team. This is not a permanent status but a temporary condition, noted by the use of 'estar' instead of 'ser'. Like any other Spanish expressions, the context is vital in order understand and use it correctly.
The band will be on tour in Europe next month.
In this sentence, 'estar de gira' is used to say that the band will be on a series of concerts around different cities or countries, in this case, Europe.
How long will the Rolling Stones be on tour?
This question is asking about the duration of the Rolling Stones' tour. 'Estar de gira' indicates that the Rolling Stones are going to many different places to perform concerts.
He would like to be on tour with his music, but he has not yet found enough sponsors.
This sentence is expressing someone's wish to go on a music tour ('estar de gira'). The person has not yet managed to secure enough sponsors to fund the tour.