Already know that (Option Key, choose library or create new library) , as worked with iTunes for as long as possible, using the itl (iTunes Library) file. But my question is regarding especially play counts to be transferred. With iTunes, the library went to external drive, and the play counts and playlists went with them. But eventually iTunes disappeared, was replaced by the Music app, and was stuck for playlists and play counts, trying to use the itl file. Found no way to do that, before the computer with iTunes on it had to be a software update. Before that, with iTunes open, I wrote down all the play counts for the Top 600 Most Played. iTunes then gone, had to resurrect the play counts manually by playing in the Music app and synced devices (took 8 months in 2024).
When I experimented by using the Option key with Music app a month ago, had a starter library with all my purchases in the cloud: no good to me. The iMac the library is on, is running out of storage by now. That is due to the internal Mac HD. Trying to find out all the steps beforehand to export all the songs, playlists and play counts from my current Music library to external drive.