April 28 - 2:55am EDT   Apple on Monday celebrated the fifth anniversary of iTunes (Music Store) with a look at back at all "all of the great music, video, and exclusives" that users discovered on iTunes and highlighting the songs and shows that defined each year. On its iTunes store, Apple offered a brief history along with a collection of "best sellers". The company, which launched the iTunes Store on April 28, 2003, claims grew its music catalog of more than 200,000 songs and a handful of exclusive tracks to more than 10 million, according to info available at the online store -- up 66 percent from the 6 million song catalog announced in early April. Update: As readers point out, the iTunes ... [full story]