Before the concert, the "antiphony" of musical instruments such as the flute in C key is A; the euphonium is used do; the French horn is used fa; the oboe is used It's D; the clarinet uses A; the trumpet uses B flat; the violin uses A.

As for the instrument responsible for leading the performance, it depends on what type of concert it is.

If it is a national music concert, then the person who will lead the performance will be a pipa or a flute; if it is a rock concert, then the person who will lead the performance will be an electric guitar; if it is an ordinary celebrity concert , then the person responsible for leading the performance is usually the guitar.

For more details, you need to consult professionals.