Whistling languages

There are approximately 70 languages throughout the world where whistling is the means of communication.
Wikipedia gives a listing of languages here.

Whistling Languages in Kuskoy Turkey YouTube.

Here is a longer example of Gomera Whistling: 

Solresol is a musical language created by François Sudre beginning in 1827 the book Langue musicale universelle was published after his death in 1866   Solresol words are made up of from one to five syllables or notes. Each of these may be one of only seven basic phonemes, which may in turn be accented or lengthened. There is another phoneme, silence, which is used to separate words: words cannot be run together as they are in English. 

More information about Solresol can be found here.