Is there an audio player with waveform seekbar? I'm looking for a player with seekbar that displays the waveform of the playing song, like http://foobar2000.org + http://foobar2000.org/components/view/foo_wave_seekbar

Specifically, a seekBar is an extension of ProgressBar that adds a draggable thumb and also provides a waveform preview of track in the background of the bar's on-screen area.
Its more of an audio editor than a player, so might not be exactly what you want, but Fission from Rogue Amoeba is an excellent tool that displays the waveform of the loaded audio file. You can zoom in and out of portions of the audio and drag the play point to wherever you wish.