Update meter2800.py

Add files using upload-large-folder tool

staged

Refactor Meter2800 dataset script: remove outdated comments, improve descriptions, and streamline data handling

Add files using upload-large-folder tool

Add validation datasets for music classification: 2-class and 4-class labels

Refactor code structure and remove redundant changes

Refactor Meter2800 dataset class by removing unused variables and simplifying example generation logic

Refactor Meter2800 dataset class and improve example generation logic

Refactor Meter2800 dataset configuration and example generation logic

Add Meter2800 dataset implementation with metadata and example generation