What are Whistled Languages and how do they Work?

Whistled Languages like Silbo Gomero exist, they're pretty interesting and this video discusses them, how they work, cultural stuff about them, creating whistled conlangs and wraps up with some glorified writing prompts.

Some Sources:
https://www.francescaphillips.com/whi...
http://silbo-gomero.com/wlanguages.pdf
http://silbo-gomero.com/pconcan_Silbo...
https://www.aljazeera.com/indepth/fea...

Chapters:
0:00 What is Whistled Language?
1:42 Tonal Whistled Languages
3:02 Non-Tonal Whistled Languages
8:11 Culture
11:21 Speculation
14:08 Outro

This content is intended for teenage audiences and up.
All clips used under fair use for the purpose of education

Music:
March of the Spoons by Kevin MacLeod
Link: https://filmmusic.io/song/4021-march-...
Modern Jazz Samba by Kevin MacLeod
Link: https://filmmusic.io/song/4063-modern...
Celtic Impulse by Kevin MacLeod
Link: https://filmmusic.io/song/3484-celtic...
Reaching Out by Kevin MacLeod
Link: https://filmmusic.io/song/4265-reachi...
Rite of Passage by Kevin MacLeod
Link: https://filmmusic.io/song/4291-rite-o...
Dantes Dream by MusicParadise
Link: https://filmmusic.io/song/5061-dantes...
All under License: http://creativecommons.org/licenses/b...