Apple's iTunes marketplace has achieved its latest milestone, smashing the 5 billion songs mark - just four months after it surpassed the 4 billion songs in terms of sales.

This is definitely a phenomenal achievement, adding more weight to the argument that traditional CDs are definitely on the wane, and artists who want to make money had best hop onto the digital virtual bandwagon instead of relying on record sales at stores.
This huge shift in sales is also attributed to the phenomenal success of the iPod from Apple.

iTunes is the number one music retailer in the US and features the largest music catalog with over eight million songs

The 5 billion mark was reached after the iTunes store opened for business back in 2003