Vienna Festival Orchestra 维也纳节日乐团

This appears to be a kind of "virtual orchestra" which existed only for the purposes of recording, largely from the 1950s and 1960s, and often associated with smaller labels. Web searches for the name (in English and German variants) turn up sites listing recordings, and little else. Recordings feature conductors of some renown, but there is little to identify any established orchestras - presumably, there was advantage to orchestra members and record companies in some form of moonlighting. The exception is the orchestra whose webste appears below - formed in 1999, it does not, however appear to have released any recordings - if any turn up, it will have to be "Vienna Festival Orchestra (2)"...

From：https://www.discogs.com/artist/712270-Vienna-Festival-Orchestra