Mainstream (in English from Main Stream means "mainstream") is in the original sense the direction in art , which is considered the most popular and widespread. Classic examples of the mainstream in Russian music can be considered Bi-2, Chaif, Mumiy Troll and Zemfira.
The word "mainstream" today is applied not only to music and in a broader sense means banal and bruising, "what the majority does". The word often has a negative connotation and implies something dull and annoying. The common expression "before it became mainstream" means "before everyone has found out about it and started actively using it."
In Russia, mainstream tourism is Turkey and Egypt , the mainstream on the Internet is contact and kotushenki, the mainstream in cars is Ford Focus, the mainstream in business is kickbacks and tax evasion.
The mainstream is in the list: Slang