It is nearly impossible to calculate the amount of channels on YouTube as new ones are created every minute (if not every few seconds). Although, according to the YouTube frequently asked questions, the amount of YouTube channels on YouTube currently number in the "tens of millions".
log in to youtube then go to "my channel" then to "Themes and Background" and choose a Background There and click "Save Changes" to save it.
The new Beta Channels hide most of your background, they are awkward, and not a very good improvement from the previous version.
Youtube has trailers.
When you subscribe to a YouTube channel, you will be able to get notifications about that channel's new uploads. You may also get occasional update newsletters containing videos from all of the channels you are subscribed to.
Probably not. Most likely they are here to stay at least until some new design is introduced.
Youtube is the best option. You can subscribe to the DJ's channels and get the updates of new uploads through notification mails.
Notifications will depend on your settings. For most users, you'll be notified if a channel you've subscribed to uploads a new video.
no one knows...
YouTube?
Make interesting content apart from all the other channels, there are so many other Minecraft channels out there. Try and make your stand out as much as possible, put out special and new content. Viewers don't want to see the same stuff over and over again, add stuff in to keep their attention.
One can find lyrics to Britney Spears's new single on the website 'A-Z Lyrics' or on YouTube. YouTube has 3,000 listings for lyrics to the new single.