What exactly were you expecting?
The main feature of IMMS is that it does not have a UI.
So here is an excerpt from the log instead:
# tail -f ~/.imms/imms.log
Tue Apr 28 10:22:51 2009
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[/mnt/media/mp3/Unheilig/Phosphor/10_-_Discover_the_world.mp3]
[2002] [Rating: 100(0)] [Last: 12h] [Jumped] [After: 97(2)]
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[/mnt/media/mp3/Virtual Server/Installed/02 Why (Would I)-emz.mp3]
[7295] [Rating: 100(0)] [Last: 21d!] [After: 100(0)]
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[...dia/mp3/Dark_Illumination/Pathfinder/Dark Illumination - 04 - Atomkrieg.mp3]
[504] [Rating: 89(6)+2r] [Last: 21d!] [After: 93(5)]
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[/mnt/media/mp3/The_Dignity_of_Labour/The Dignity of Labour/03 Hide-emz.mp3]
[7248] [Rating: 100(0)+4r-13a] [Last: 21d!] [After: 100(0)]
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[/mnt/media/mp3/Seabound/No_Sleep_Demon/10 - Seabound - Rome On Fire.mp3]
[1220] [Rating: 100(0)+12r-21a] [Last: 21d!] [After: 100(0)]
[Rating: X(Y)+Xr+Xa]
X(Y) base rating of the song
X is the mean, and Y is the std dev (think confidence interval)
+/-X[a/r] indicates cummulative relationship of the current song to the last played, and last manually selected songs
r = correlations, i.e. how often are these two songs played together?
a = acoustic, i.e. How acoustically similar are the these songs?
[Last: X!]
This song (or another recognized remix of it) was last played X days/hours ago.
The ! indicates that the song was actually played longer ago than shown, but the value was truncated based on the length of the playlist. Note: never is a long time.
[Skipped]
The song was skipped before it ended. Its rating will be decreased.
[Jumped]
Indicates that the next song was manually selected by the user.
Songs that are jumped to will get a big rating boost.
[Unknown]
Indicates that IMMS could not guess the artist and the title of this song.
[After: X(Y)]
X(Y) new rating of the song after the current play event.
The change depends on whether or not the song was skipped, or jumped to, as well as a variety of other factors.
[New]
Indicates that this is the first time IMMS has played this song.