Die Marsrakete (1956). Instead it is one of the many children's story records that were issued in the 1950s and 1960s. Record players moved from the living room to the playroom in the 1950s and children had a vast number of records intended just for them.
Once again I do not read German but can get a sense of the storyline from the illustrations. First of course are children given the opportunity to ride on a rocket. In some stories they sneak on and in others a friendly scientist "uncle" invites them on a trip.
Luckily (this was the early space age) something went wrong and instead of going to Mars the rocket capsule came down in the Middle East. I might not have called this "Mars Rocket" but rather "an unexpected rocket trip". But even with false advertising the images are very beautiful.