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Upgrading from iTunes 10 to iTunes 11 will not remove any songs from your library.
Apple's iTunes software is free and can be downloaded from their website (See links below).
There are usually 4 trillion to 10 trillion illegal songs downloaded each year, while 4 billion songs are legally downloaded. wow.
The 10 billionth song, "Guess Things Happen That Way" by Johnny Cash, was downloaded by Louie Sulcer of Woodstock, Georgia. As the grand prize winner of Apple's 10 Billion Songs Countdown contest, Louie will receive a $10,000 
iTunes Gift Card.
just go on itunes
Search for the Itunes Charts tat will give you their listing If its for your own most played then; Go to your iTunes (or Last.fm, or whatever equivalent music service you use) and sort by play count.
There is free songs but it's too little maybe 10% or 20%
last ten songs of whom
depends on price but about 10-15
The latest version, which is 7.5, takes 41.1 MB And it can be downloaded from this location: http://www.apple.com/es/downloads/
To download iTunes 8.2 you need to go to the iTunes download page (See links below) and click on the Download Now button.
Not really. With the prices, maybe 90% of the songs cost $1.29 while the other 10% costs 99 cents