Audacious

All you need to do (and it sounds like you have already done this) is to change the folder that is shown in the drop-down list at the bottom of the Search Tool and then click on the refresh button. The Search Tool will update the Library playlist so that it contains all the song files in that folder and no others.

Does that answer the question, or have I misunderstood something?

lol

Yes, we understood and yes, i did what you recommend.
But in the playlist column "artist" it always displayed "music", which is the folders name on the internal hdd. This confused me, beacause after i had input only the data from the external hdd, the column "artist" showed the name of the artist and not the name of the folder. Therefore i thought, there might be some kind of "interference" or what so ever. Now i realized, when i play a song or only hover the mouse pointer over it, the column "artist" gets updated correctly.

So i guess, everything is fine. Only my approach was too circuitous.

Thank you! ;)

That's odd. Try refreshing the playlist (F5).

I tried refreshing of a playlist AND
now every artist is called "music" again!
LOL!!

Don't mind, i can live with it. ;)