Music Production Guides
Answers to music production questions, backed by measurements made with ToneNook tools and reproducible steps. Every number comes with its measurement date and method.
How to Find the BPM and Key of a Song — Measured Accuracy
Load an audio file into the BPM and key analyzer and it estimates the tempo and key in your browser. On 14 synthesized test signals with known answers, BPM was within ±1 for 12 and came out at half or double for 2, and the key was correct for 12 of 13 (measured 2026-10-01).
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MP3 vs WAV — Measured File Size and Audio Quality
WAV is a lossless format that stores the original audio at about 10.6 MB per minute, while MP3 at 320 kbps takes about 2.4 MB (23% of WAV) but is lossy and reduces content above 20 kHz.
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