How to Down-Pitch A Song Using Python

If you’ve ever wanted to change the pitch of a song without altering its speed, this blog post is for you. Pitch-shifting is a common task for musicians, DJs, and audio engineers. In this tutorial, we will explore how to down-pitch a song using Python and the pydub library and apply this process to multiple songs in a folder automatically.

In music, pitch-shifting means changing the pitch of a song (raising or lowering it) without speeding it up or slowing it down. This can be useful for:

Now let’s dive into the Python script that automates pitch-shifting for multiple songs in a folder. The script loops through the files in a songs folder, down-pitches them by a half-step (semitone = -1), and saves the new files to an output folder.

Pitch-Shift Function: The pitch_shift function adjusts the sample rate of the audio. When we change the sample rate, the pitch changes. In this case, we calculate the new sample rate to shift the pitch down by one semitone using the formula:

Input and Output Folders: We define the folders where we will read the audio files and save the pitch-shifted versions. If the output folder doesn't exist, it will be created.

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