Levite Sings with a Harp at Jerusalem's Gateby emmanuel_higgins

Psalms 87:7

As well the singers as the players on instruments shall be there: all my springs are in thee.

Singers as well as players on instruments will be present in Zion in the life to come. Their presence there shows that music and song continue in that future life. That continuing music and song is the music and song of the redeemed. They join in it together in Zion. There they rejoice together in the future glory of God's kingdom.