foo_vis_spectrum_analyzer
https://github.com/stuerp/foo_vis_spectrum_analyzer/releases

New: The album art type that is shown on the background can be selected in the configuration dialog.
New: The log verbosity can be set on the Common page of the configuration dialog.
Improved: Stability of album art rendering with multiple instances and heavy load.
Fixed: Rendering negative infinity in the peak meter readout was broken. (Beta 2 regression)
Fixed: Analyzer initialization after channel configuration changes.