Wierd cave noise at menu screen

== is not important part
Now I usually don't put on the music for I have my own taste of things, so here I am leaving minecraft open on the menu screen. Note that I just logged onto minecraft after closing it when going on my world about 5-10 minutes ago.

==Just looking though mojang.com, look at the info of minecon altho I wont go ==

And then I hear a cave ambience noise from my still open minecraft. I searched up this video
https://www.youtube.com/watch?v=LwcgG7ZYlFE
And I heard noise #1 at a lower pitch.
Not sure if its intentional, I don't see "added cave ambience" to the menu screen on the minecraft gampedia menuscreen page for patches.
So either that's something for you guys to check out, or add a small thing to the website
Sorry if theres no proof for I have no recording software that just so happened to be there at the time...