The phrase "angelic choir" refers to a group of heavenly beings, called angels, singing together harmoniously. It portrays a beautiful and divine scene where their voices blend in perfect unison. Full definition
But one more desperate twirl around the back of the store and we ended up finding a hidden bargain bin, and lo and behold... -LCB- insert angelic choir singing from the heavens -RCB- the end of a bolt of lovely (I think it was Waverly?) (theinspiredroom.net)
At once the angel was joined by a huge angelic choir singing God's praises: (sarahbessey.com)
St Nicholas, like a shepherd, giving what he could; Dickens, Washington Irving, and Thomas Nast as three Victorian wise men; angelic choirs like those carol writers and poets; even Cromwell, like Herod, a grumpy ruler trying to stop Christmas. (premierchristianity.com)