Скачать или смотреть Analyze MIDI Files and Output Their Keys with Python Loop Function

Discover how to create a loop function in Python to analyze the keys of MIDI files and output the results in an organized format.
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Analyzing the Key of MIDI Files Using Python

If you're diving into the world of music analysis, the ability to extract and analyze the musical key of MIDI files can be incredibly valuable. Whether for research, project development, or personal interest, understanding how to automate this process can save you a significant amount of time. In this guide, we'll walk through how to create a loop function in Python that analyzes the key of each MIDI file in a specific folder. By the end, you'll have a clear understanding of how to output the results in a structured way.

The Problem

Imagine you have a collection of MIDI files stored in one folder, and for your project, you need to determine the key of each file. Not only do you want to know the key, but you also need to compile this information into a neat Excel sheet with the filename and its corresponding key. This would provide you an organized view of your data for further analysis or presentation.

The Solution: Step-by-Step Guide

To efficiently analyze each MIDI file and extract the required information, follow these steps. We'll use the music21 library, which is designed for analyzing musical content, coupled with the os library to manage the file directories.

1. Import Necessary Libraries

Start by importing the required libraries—os for directory navigation and music21 for MIDI file analysis.

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2. Traverse the Directory to Find MIDI Files

Next, we need a function to go through all the files in the designated directory and pick out those with the .midi extension.

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Here, we're using a for loop to navigate through each folder in the specified path, filtering for files that end with the .midi suffix.

3. Analyze Each MIDI File's Key

Once you've found a MIDI file, you can load it and analyze its key, extracting both the tonic (key note) and the mode (major or minor).

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In this code block:

We parse the MIDI file using music21's converter.parse() method.

We then call .analyze('key') to get the musical key.

Finally, we print the filename along with its key and mode.

Complete Code Example

Here’s how the complete code looks when all the pieces come together:

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4. Exporting Results to Excel

To make your results even more useful, consider exporting them into an Excel sheet. You could use libraries like pandas to create a DataFrame then export it to an Excel file.

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This will generate an Excel file named midi_keys.xlsx with all the analyzed data neatly organized.

Conclusion

By automating the process of analyzing MIDI files, you can focus more on your research, creativity, or projects without getting bogged down in manual data entry. Utilizing Python with the music21 library not only simplifies this task but opens up an array of possibilities for further musical exploration. Happy coding and exploring the world of MIDI!