[jingai]

When I now try to play 2Pac, Alexa in one case played "rat pack", in the other she couldn't find "tupac". "2 unlimited" on the other hand worked.

Without a curated database, it's impossible for this to ever be perfect for every single artist name. But, as you can see, it does indeed at least try

And I tried to make her play the album "bat out of hell II" by meat loaf by asking her to "play the album bat out of hell 2 by meat loaf". Of course T did it in german and once I tried it with the german "zwei" for 2 and once with "two".
In the first case she told me that she couldn't find an album "bat out of hell" by "2 unlimited". But the log doesn't have an entry for that.

This means Amazon intercepted it and Alexa tried to process the request on her own. This can happen on occasion and we don't really have any control over what Amazon decides here.

In the second case she told me that she couldn't find an album "bat out of hell" from "talco". This is documented in the server logs.
In the third case she ended up playing "bat out of hell" but not the 2nd one

Could you post the transcription of your requests? Preferably for both of these.

How is the album listed in the Kodi library? Is it, exactly, "Bat out of Hell 2"? Or does it use a roman numeral to represent 2? Is there a subtitle attached to the title, such as, "Bat Out of Hell 2: Back Into Hell"?

If there is a subtitle on it, you'll need to speak the entire title (or at least, most of it). This is because when you say just, "bat out of hell 2", it will more strongly match to "bat out of hell" than "bat out of hell 2: back into hell".

Again, without a curated database of artists, albums, songs, etc.. we can't do much better than this.

And for my "Sex Sex Sex" album by J.B.O. the following happend:
I asked her to "play the album Sex ... by JBO" and she answered that she couldn't find the album "seal" by "J.B.O.".

Alexa simply misheard you in this case. In your Alexa App, you can check the history to see what she heard. The skill can't really 'correct' these sorts of issues, unless the result is somewhere close to your intention.

Then I asked her to "play the album Sex ..." (without artist). her answer "I couldn't find the album sechs sechs sechs". This is what the logs say. And sechs is the german word for six. But indeed the pronounciation is almost the same

"Sechs sechs sechs" definitely might not fuzzy match to "sex sex sex". They sound similar to you and I, but they're probably not close enough for our matching.

The summary here is.. I think we're matching generally about as well as we can without some external database to help us translate the sorts of names musicians tend to use. There are databases out there that do this (musicbrainz and the like), but I'm rather hoping Amazon opens up their own matching to the built-in intents since they clearly already do this for their own music service.

If you could continue adding utterances back in section-by-section (in alphabetical order, preferably), hopefully we can identify at least one side of the conflict. Then it would be a matter of drilling further into the ones you already added, taking them back out until it saves again.