Finding your music's bpm (or beats per minute) is a great way to build playlists that work together. If you just need to do a quick check online, Song BPM finds the bpm of a track with just the title and artist name.
Rather than downloading an entirely new music player, Song BPM just does one thing and does it well. It will find the song you search for, display the duration, bpm, and provide links to Spotify or Amazon MP3. What you do with the information is up to you.