WHY “they must have listened” and what does it mean this sentence?

I understand the whole context and the words meaning, but am confused with why “they must have listened”, and particularly what does “something” refer to in the sentence? My guess is “some professional, different types of music”? But then it leads back to why “they must have”?? (my guess of “they” probably referring to the orchestra players they have just listened to )

Here is the context:

We sat in silence, gazing at the castle. Normally, at night, it was
bathed in a kind of orange glow from the lights dotted around the
fortress wall. But tonight, under a full moon, it seemed flooded in an
ethereal blue.

‘What kind of music would they have played there, do you think?’ I
said. ‘They must have listened to something.’

‘The castle? Medieval stuff. Lutes, strings. Not my cup of tea, but
I’ve got some I can lend you, if you like. You should walk around the
castle with it on earphones, if you really wanted the full
experience.’

The context is :
The two people sitting in their car chatting, just coming back from a concert which they both enjoyed, still lost in the remembered music.

Answer

I don’t think that the person speaking is thinking aloud about the concert they were just at. Rather, it sounds like they’re wondering about what sort of music was played when the castle was first built. A more complete version of the sentence would be something like:

“What kind of music would they have played in the castle in Medieval times when it was first built?” I said. “The people back then must have listened to some sort of music.”

This makes sense with the response talking about ancient music featuring lutes and other stringed instruments.

The choice of phrasing is intended to imply that the speaker assumes that as foreign as the culture in the castle was hundreds of years ago, music was still part of their lives… they “must have” listened to some sort of music.

Attribution
Source : Link , Question Author : user86301 , Answer Author : Catija

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