O Radix Jesse, qui stas in signum populorum, super quem continebunt reges os suum, quem gentes deprecabuntur: veni ad liberandum nos, jam noli tardare.
O Root of Jesse, which standest as a sign to the peoples, at whom kings shall shut their mouths, whom the gentiles shall beseech, come to deliver us, delay thou not!
The Tree of Jesse, from the chapel of the Conception of the Virgin and of St. Anne in the cathedral of Burgos, Spain.
(By the way, the recordings of the O Antiphons which I have used these last few days are from the youtube channel of the English Dominican studentate; you can check out the whole channel for a lot of interesting pieces of the Dominican liturgy, inter alia, and also their blog, Godzdogz.)