Apps to Visualize Music

VLC Media Player is a free and open-source cross-platform multimedia player that plays most multimedia files as well as DVDs, Audio CDs, VCDs, and various streaming protocols. Known for its robust format support and stability, VLC is a favorite for playing virtually any media file without the need for external codecs.

MilkDrop is a dynamic, hardware-accelerated music visualization plugin primarily for Winamp. It transforms audio into captivating visual experiences, reacting in real-time to the music's nuances. Users can enjoy pre-set visualizations or customize their own, offering an immersive auditory-visual experience.

Rainmeter is a free and open-source desktop customization application for Windows. It allows users to display various types of information, such as system metrics, time, weather, and RSS feeds, directly on their desktop through highly customizable 'skins'. It's a popular tool for creating personalized and functional desktop interfaces.

Winamp is a versatile media player known for its extensive format support, customizable interface, and robust library management. It provides a classic yet powerful platform for enjoying music, videos, and online content, with features like internet radio streaming, podcasting, and various synchronization options.