11.10music player
In 11.04 I used banshee or rhythmbox because it had a feature that told me, when I was listening to a song what other bands from other similar groups I would enjoy. Most of the time it was correct or at least it helped me find a group I have not heard for a long time.
In 11.10 neither of them have this feature or at least I do not know which one had it and how to activated it again.
What music player has this particular feature in 11.10
DeadBeef is actively developed and in a way that brings it closer and closer to Foobar2000.
(what it lacks in Foobar2000-features (numbers of addons) it compensates in being light and up-to-the-point - the most straightforward and non-bloated music player/handler I have seen until now in Ubuntu).
With File browser plugin:
With Infobar plugin:
to install it:
sudo add-apt-repository ppa:alex-p/deadbeef
sudo apt-get update
sudo apt-get install deadbeef
Or download as .deb and install (i686 or amd64)
To install plugins, wich are .so files, they should be put into a certain folder.
~/.local/lib/deadbeef/
or: /usr/local/lib/deadbeef/
For the static portable version it is deadbeef-versionnumber/plugins
Considering problems of incompatibility and other issues in using the plugins, see this related answer
To convert audio files, see this question+answer.
Considering memory use, Deadbeef is much lighter than other players that might be considered foobar-like.
The latest versions (now 0.6.2) bring it even closer to foobar by the 'Designer mode' feature (similar to the layout editing mode in foobar) by which built-in or plugin features (file browser, infobar etc) are integrated to the interface:
File conversion is now very close to Foobar2000's - see the link above on conversion.
Already mentioned in answers, a great alternative is Clementine.
The command, as WarriorIng64 already said, is xkill.
To show some instructions for the end user, maybe use
notify-send "Click on an application to force-close it, or right-click to cancel."
Now to combine two commands into one launcher, you'll have to wrap them in sh -c '...', so your .desktop file should say
Exec=sh -c 'notify-send "Click on an application to force-close it, or right-click to cancel."; xkill'
Best Answer
Banshee still has that. You have to make sure that you have enabled the Last.FM-scrobbling plugin in the settings and then check the context pane under view to be shown. I don't know about Rhythmbox but other than that, Tomahawk player has a similar feature.