lost uploaded files on itunes

Hi,

Music added to iTunes on one computer does not automatically transfer to a new computer. See Move your iTunes library to a new computer - Apple Community

If you subscribed to iTunes Match or Apple Music, your music would be added to your iCloud Music library and such music would be available for you to stream or download on other computers.

Did you keep backup of your music or can you recover the music from your old computer?

Jim

Hi,

The iTunes/ Music library has never automatically backed up music to the Cloud.

iTunes Match and Apple Music (both subscription service) match or upload music to iCloud Music. Whilst you have the ability to redownload your music to new computers with an active subscription, they are not considered to be back up services and separate backups are recommended.

Is it possible that you can recover the music from the old hard drive? Do you have an iPod or iOS device that has your music?

Previous iTunes Purchases can be re-downloaded. Redownload music – Apple Support (UK)

Jim