老调重弹 [- - chónɡ tán]sing the same old song; beat over the old ground; harp on the old tune; harp [play] on the same old tunes; harp on the shopworn theme; harp on one [the same] string; strike up the old tune about ...:
•¶ 他们又要继续谈判？这不过是老调重弹。 Do they intend to resume the talks? This is nothing but playing the same old tune.