Comment found to a video about Improvisation:
"silly? Tell that to Beethoven , Bach, Mozart, um basically any great composer. All great composition begins with improvisation. With spontaneity, with a moment of inspiration wich has nothing to do with being 'intellectually rigourous' If you are a musician then you will know what I mean, otherwise you need to do some more listening. ;)
Whoever this person is, he is an ARTIST.