You can either use Rhythmbox (iTunes-like music player) or Totem
(Movie player) to play music files. Both are installed by
default.
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Rhythmbox is the default music player in Ubuntu 10.10. Ubuntu is
classified as open source software that runs desktops, smart
phones, and tablets.
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it should come into the system by default. if you are having
trouble trying to use it then you could go to the help program of
the operating system it should help you there.
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The default music player for Ubuntu 10.10 (Maverick Meerkat), is
Rhythmbox, but that has been replaced in favor of Banshee since
version 11.04 (Natty Narwhal).