I'm storing a huge set of songs in a MySQL database. This is what I store in the 'songs' table:

CREATE TABLE `songs` (
  `song_id` int(10) unsigned NOT NULL auto_increment,
  `song_artist` varchar(255) NOT NULL,
  `song_track` varchar(255) NOT NULL,
  `song_mix` varchar(255) NOT NULL,
  `song_title` text NOT NULL,
  `song_hash` varchar(40) NOT NULL,
  `song_addtime` int(10) unsigned NOT NULL,
  `song_source` text NOT NULL,
  `song_file` varchar(255) NOT NULL,
  PRIMARY KEY  (`song_id`)
) ENGINE=MyISAM AUTO_INCREMENT=1857 DEFAULT CHARSET=latin1

Now I'd like to keep track of how many plays each song has, and other song-specific data that relates to the song. I don't want to keep adding fields to the 'songs' table for this. How can I store song related data a more efficient way? What's the best practice here?