The singer and pianist ___ going to hold a concert in the Bird's _英语解答

The singer and pianist ___ going to hold a concert in the Bird's Net next week.
为什么用is 不用are

人气：230 ℃　时间：2020-03-23 20:04:56

解答

is
这是同一个人的两个头衔
否则就会说 The singer and the pianist,这才是两个人