History of music video's.

Started in the 1920's-30's.
1960's promo-'hard day's night' and other rock films-focused on band.
1970 promo- top of the pops started to use them as a substitute when performing bands were on tour.
1975-start of the experimental/breakthrough era-Queen- Bohemian Rhapsody-(CLASSIC).
Early 80's- Beginning of MTV-artists began to take promotion of the band and the release of the song seriously, so all songs all had a video.
Multichannel music TV- growth of different genre of channels and real divide of music.
Mid 80's-Black music broke out into the market.
90's-other channels broke out channels from spin-offs e.g. kiss, smash hits, Q etc.
Nowadays - every song produced (singles) all have videos, and they are getting more conventional and experimental.Music videos in order of release and conventions used!
1935-colour box