What does blue mean

[Over the top]

I find this in radio genres like dirty blues?
Also what does 50s 60s 70s mean
Thank you

 

[emsr2d2]

I find this in radio genres like dirty blues?
Also what does 50s 60s 70s mean
Thank you

The blues is a genre of music. Google it and you will find plenty of examples.

50s/60s/70s etc refer to decades.
The 1950s (shortened to "the 50s") would be 1950-1959
The 1960s (the 60s) is 1960-1969

etc etc.