Sell out

[Donald Trump]

One who betrays a cause for personal advancement.
The popular definition of sell out allows it to be used as an insult towards anyone in show business. On the contrary, there are many bands which are considered sellouts which are not.
For instance, Green Day. They are considered sell-outs because they are a punk band who was popular on MTV. Green Day never stated that they would never be on MTV, thus they are not sell-outs in that sense. They never changed their musical style for monetary reasons, thus they are are not sell-outs in the more literal sense of the word. If Fugazi were to sign up with Sony records, they would be selling out because they preach against major labels.

[Sonia]

Anyone who sacrifices artistic integrity in an effort to become more successful or popular (generally in music); someone who forgets their roots.

[Mark Zuckerberg]

nelly

[Britney]

when a band/singer/rapper changes their music/style in order to sell records.

[Justin Bieber]

Compromising your integrity, usually for money. Its that simple. This word is mostly used to describe bands that go mainstream.

[Sonia]

1. what happens when person A listens to an unpopular band to set themselves apart from the crowd, then that band becomes popular and all the people that person A hates (usually from school) enjoy that band too. because of this person A will get angry at their band and say they are sell outs.

2. when person A goes to the grocery store looking for an item and it is not in stock.

[Julian]

to sell all of the supply that you have of something: