Opening old iTunes Libraries on external hard drives in Music in Catalina.

I am a picture/sound editor. Over the years I have kept a variety of iTunes media on separate hard drives with a dedicated iTunes library for that media on the same drive. The sources of the media vary from digitised vinyl to CDs and personal/professional recordings. I use iTunes as a way to review sounds before importing them into my editing app.

According to my need: Sound effects or Music for professional use (AIFF/WAV), or music for personal use (mp4), I have previously always connected the relevant drive, alt clicked, when opening iTunes, then selected the library I needed at the time. Most of the library's media are far too big for my computer, hence the hard drives. This organisation represents years of work. Is there any way I can keep these iTunes libraries on their dedicated hard drives and open them in Music and keep all my meta data? I have tried various solutions suggested elsewhere. None has worked so far.

Thanks.