You hear that song at a lot of weddings, don't you?
A lot of people play that song at their wedding, don't they?
この場合、次のような言い方できますよ。
ーYou hear that song at a lot of weddings, don't you?
「その曲はたくさんの結婚式で聴きますよね」=「その曲は結婚式でよく聴きますよね」
ーA lot of people play that song at their wedding, don't they?
「多くの人はその曲を結婚式で流しますよね」=「その曲は結婚式でよく流れますよね」
ご参考まで!