A Complex Math Problem

Here are the facts:

I have 888 songs on an iPod playlist I call Blast! that I play on shuffle. This is the playlist that I workout to.

I workout on the treadmill for an hour about five times a week (since Thanksgiving).

I run somewhere between 5.5-6.0 miles during that hour.

The songs on Blast! range between 1 minute 23 seconds ("Walk Among Us", by The Misfits) to 11 minutes 15 seconds (Black #1, by Type O Negative).

All but 19 of the 888 songs on Blast! are the finest hard rock, punk or metal songs from my vast, vast collection.

In the interest of full disclosure, many metal purists would call quite a few of these songs "false metal".

At least seven of the 888 songs are cover songs. Of these, two of the originals also made the playlist.

The newest song that I've added to Blast! is "Say You'll Haunt Me" by Stone Sour, which is Corey from Slipknot's other band. The name of Slipknot's fan club is "Dead Generation". I am not a member.

Conundrum: How is it that, invariably, I listen to exactly 16 songs during my workout?