Spotify is the world's leading genuine music streaming service platform for both PC and mobile platforms, founded in 2006 by Daniel Ek and Martin Lorentzon from Sweden. It provides both free and paid services, and has a wide range of users around the world. Free users will be subject to certain advertisements when using Spotify's services, and there will also be some restrictions on functionality. Paid users have no ads, better sound quality, and additional features such as downloading music and offline listening.

Tangerine! is a fast music rhythm analyzer and automatic playlist creator for Mac OS only, discontinued but still helpful for some users. It enables user to quickly and easily create upbeat, relaxing playlists for working out, nodding off, and so on scenes. It works by analyzing the BPM and beat intensity of your music collection in your iTunes library. Its slogan is - Spend your precious time listening to music, not making playlists.

1by1 is an excellent audio player tool by Martin Pesch (its another quality audio tool is mp3DirectCut), know as its ultra small size and single-minded function. Compare with Winamp and many other mainstream audio players, 1by1 uses much less memory (run, play and minimize), and the gap is very obvious!