Some bands were recording their music in two languages. The most famous example is obviously KRAFTWERK - most of their albums are recorded in German and English. TELEX were making English and French versions of their hits - like Eurovision and Moscow Discow. ABBA did never forget about their non-English origin - making Swedish versions of their songs - and even a Spanish version of all their hits on a special compilation LP.
Do you know of other 80ies bands or singers which were bilingual too??