By their fourth album, "Eldorado", ELO had gone from overdubbing their small membership to recording with real orchestras. They had problems when they worked in their native England. British classical musicians usually kept more to union rules than to the job of making music. They sometimes walked out during recordings. This hurt the process of making their records, so ELO tried a studio called Musicland in Munich, Germany. They liked the way the studio worked, and the German musicians were more devoted. ELO used Musicland many more times.