English folk trio the Staves opened for Florence + The Machine at Manchester Arena earlier tonight, and before the show, the Stavely-Taylor sisters warmed up by performing an a cappella rendition of Joni Mitchell’s classic “A Case Of You” in the corridor. If you’ve listened to the Staves before, you already know this, but seriously…those fucking harmonies. Also, they just seem like they’re having fun singing it, which is cool. Watch below.