It's rare that a day passes in our house without music being played somewhere. But because we're now working on the launch of Syntonetic's Moodagent playlisting application for iPhone and iPod Touch, I've been spending even more time than usual listening to my own music, thinking about playlists, and what makes a good one.

In my previous post I wrote about the digital music dilemma: when you've accumulated so much digital music that you can't remember all the tracks in your library, how do you decide what to play? Picking tracks at random can sometimes be interesting, but it doesn't work when you want to hear a particular kind of music.

In this post I look at music tempo and music genre as two possible characteristics that might be useful in creating a playlist that is less random.

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