Use Astro Martian's free Song Key & BPM Finder to analyse an audio file and estimate its musical key and tempo. Upload your song, beat or instrumental to quickly identify its key and BPM — useful for music production, remixing, DJ preparation and working with samples.
NOTE: Key and BPM detection results are estimates and may vary depending on audio quality, song structure, tempo changes and recording style. Always verify results by ear or with your production software.
Upload your audio file to the Song Key & BPM Finder and let the tool analyse the track. It will estimate the musical key and tempo in beats per minute (BPM), giving you useful information for music production, remixing, DJ preparation, sampling and matching tracks.
BPM stands for beats per minute and describes the tempo or speed of a piece of music. A higher BPM generally indicates a faster track, while a lower BPM indicates a slower tempo. Knowing the BPM can help producers, DJs and musicians match tempos, create remixes and keep different musical elements in time.
The musical key identifies the tonal centre of a song and the group of notes and chords that naturally work together. Knowing a track's key can help when adding melodies, vocals, samples or instruments and when combining songs for remixes, mashups or DJ mixes.
Finding both the key and BPM can make it easier to work with existing audio. Producers can use the information when sampling or remixing, DJs can use it when matching and mixing tracks, and musicians can use it to understand the tempo and harmonic structure of a song before creating new parts.
Key and BPM detection is based on audio analysis and should be treated as an estimate. Results can vary depending on the recording, arrangement, tempo changes and complexity of the music. For critical production work, use the result as a starting point and confirm it by ear or with your preferred music production software.