I’ve spent the past couple days playing around with Alex King’s iTunes Stats program. It’s written in PHP/MYSQL and requires a web server to run. With the MAMP one-click server running on my PowerBook, I had little trouble installing the program (though I did have to substantially increase the PHP timeout setting so it could handle my large library).

iTunes Stats reads XML files, one can load an entire iTunes library or export playlists for more selective examinations.

The program also comes with a number of built-in reports, such as Most Played Albums, Most Played Artists. Top Rated Albums/Artists and the option to weight by number of rated songs and play counts. The engine supports adding custom reports, so if you are motivated enough, you can create new methods of analyzing your music.

My PHPMYSQL-fu is not very strong virtually non-existent. Still, I was able to cobble together my own metric: Artist Impact.

An Artist’s Impact is measured by the total number of play counts they have received divided by the number of songs that artist has in the library. For example, Artist A has 20 songs in the library and those 20 songs have been played a total of 100 times. Thus, 100/20 = 5. That’s Artist A’s Impact. Basically, it tells you, the avergage number of times a song by that artist has been played.

This formula is a way to compensate for the bias present when some artists have significantly more tracks than others. In my case, I have 329 songs by film composer Jerry Goldsmith. He has an inherent advantage over say, The Breeders, who have 63 songs in my library. By virtue of being so prolific, Jerry is naturally going to have more play counts.

After playing around with it a bit, I’ve made some interesting observations. Firstly, the top 21 most impactful artists in my library, with one exception, have only one or two songs. In cases where an artist has a low number of songs, each play count is “worth more” in relation to other artists. A single play by an artist with only one song nets that artist a full “point,” whereas as single play by an artist with 20 songs would only gain .05 points.

Fortunately, I’m able to set a threshold for display, keeping outliers from being counted. Here’s my top ten High Impact Artists. The artist must have at least five songs in my library. Additionally, this list only takes into account “popular music” (excludes classical, live shows and film/tv scores).

	Artist	# of Songs	Plays	Impact (avg plays / song)
1	Jet	7	73	10.4286
2	Rilo Kiley	55	512	9.3091
3	Glitter Mini 9	7	65	9.2857
4	National Skyline	10	92	9.2000
5	The Strokes	47	426	9.0638
6	String Theory	5	38	7.6000
7	Mercury Rev	34	257	7.5588
8	mouse on mars	154	1116	7.2468
9	Cex	37	264	7.1351
10	Bran Van 3000	34	228	6.7059

I’m very surprised to see Jet in the number one spot. That’s because my affinity for the band has waned to virtually nil. Still, it’s hard to argue with the dent Are You Gonna Be My Girl? made in my listening habits back in ’03. The ironic part is that overall, I didn’t care for Get Born, so I ended up deleting five of the thirteen songs on the album. Those weaker songs aren’t there to dilute Jet’s Impact by lowering the ratio of play counts to songs, so the band’s number seems artificially inflated.

Overall, I’m having quite the enjoyable time playing with iTunes Stats, even though it’s a little rough around the edges. I’m working on a couple of new reports and have even figured out how to get it to tell me which albums are missing ratings and how many ratings need to be completed.

Fun times ahead!