2 Verbs to Use for the Word warble

New-born flocks, In rustic dance, Frisking ply their feeble feet; Forgetful of their wintry trance, The birds his presence greet; But chief the sky-lark warbles high His trembling, thrilling ecstasy, And, lessening from the dazzled sight, Melts into air and liquid light.

Saul had taken down that wild warble of Longfellow's, "Hiawatha."

2 Verbs to Use for the Word  warble