In our grade school they had a Seattle Symphony Orchestra violinist come and play in our classroom. He demonstrated the range of the instrument with about half an hour of music, and explaining classical music, what it is like to attend a concert. This was so we would keep quiet and know when to applaud on our field trip to Seattle the next day.
The next year I played piano, then took accordion lessons, then for 6 years jr high to high school played French horn in band. In band I learned to play trumpet, and a little sax. After that I took up harmonica for a while.
Altogether that's about a decade hearing live unamplified acoustical instruments on a regular basis. Not just hearing either, but listening critically, because to play we must be in tune. Also there is a huge amount of technique involved, all of which you have to learn to hear and evaluate in both yourself and the other players.
In Jr High and High School I also attended a slew of concerts- band, orchestra, choir. All of it live and unamplified.
So yeah I guess you could say I know what live music sounds like.
Having said that I think the whole "do you know' thing is overrated. The question is not do you know what live music sounds like. The real question is do you know what anything sounds like? The real question is, Are you a listener? Or do you merely hear?
Because in band, we had to be taught to listen, including what to listen for. Once you learn that, turns out it works for everything.