Instead of writing to inform people or to entertain them, you need to write your script as a way to create a conversation. You need to imagine what someone would say to another person and then put it on the page. Don’t be afraid if it feels like you’re talking to yourself — that just means you’re writing well.
Someone is late for the conference call, so the music starts. "Well, I've been sitting here all day," the song begins, sort of croony, with a vaguely country affect — the kind of opening that leads you to expect there is, somewhere, an ex-lover who probably isn't coming back. A certain variety of pining. But then, a few bars in, a turn: "Yes I'm waiting on this conference call, all alone. And I'm on hold, yes I'm on hold... I hope it's not all day, ey!"

If you would like a pause in your message where just background music (or blank airtime) plays, place (...) in your script where you want the pause.
You might be thinking, “Great, thanks for the info, I’ll go pick something neutral, like classical, or upbeat, like pop.” Slow your roll—there’s a lot more to hold music than just genre.