Sellout

[Sonia]

When an artist conforms to the way record labels, managers, etc see them to make money through commercial success and generally not the original fan base.

When an artist conforms to the way they believe their fan base sees them.

When an artist gets too big for their own good, and believe that they are god(s) and can do anything they want.

When an artist changes their play style to make more money

An artist which no longer does it for the fans

[Couch Potatoe]

A word that would be useful if stupid poseurs didnt use it all the time.

[Tina]

A vague but derogatory term blindly used by music fans to describe bands who make (or have managers who make) a new lucrative and/or artistically experimental decision (for example: accepting a product endorsement, a change in the bands expected composition style, switching to a larger record label, dressing with more class, speaking out against mass mp3 piracy, etc.) The word is sometimes also applied to bands who simply get more commercial success through no additional effort.
The anger comes from the false belief that fans own their favorite entertainers, that these entertainers are thus not real humans with free will, and the feeling of grief when some CD that the listener previously enjoyed alone is now enjoyed by millions of more people.
(Note that sellout ONLY applies to those who make a living in the fine arts. For example, a software engineer who accepts a job promotion and higher salary is never branded as a sellout. Nor is a professional athlete who appears on a box of Wheaties.)

[Vania]

The selling of an entire stock of something, especially tickets for an entertainment or sports event.

[Britney]

In the words of zefrank, a sellout doesnt have to do with actually having money, it has to do with the [perception] that your [pursuit] of popularity and potentially making money has caused you to sacrifice your [core values].

[Kit]

[A band] who changes their music to include more [poppy] parts, to gain [popularity]. Often confused with getting famous, getting better sound and writing less heavy music.

[Justin Bieber]

[Selling out] is [compromising] your musical intentions and we dont know how to do that.-Mike [Dirnt] of Green Day. I couldnt have said it better myself, beings as its hard to define a sellout.

[Kit]

Just want to make it clear tat because an [artists] song is used in a commercial (like [Back in Black]}in that [shitastic] gap jean ad) doesnt mean the band has a soldout. The record company often owns the rights to the song and gives the Advertising Agency the right to use it.

[Marquetta]

An event for which all tickets are sold.

[Julene]

a performance or sports event for which no more tickets are available, because it is so popular: