thank you very much for your help.
This is a tape-recording I made more than 40 years ago. I had written down "Traum-Walzer" at this time, but now I had not been able, to confirm that; I did not find any piece of music that sounded like it. With your information of the composer, I found a record by Willi Boskowsky and the Wiener Johann Strauss Orchester.
Looks like my tape-recording starts in about the middle of this recording.
Many thanks again!!!"