Yamaha
Yamaha is a large Japanese company that makes everything from pianos and drums to motorbikes and boats. In the realm of synthesisers, they're perhaps most famous for licensing the rights to FM synthesis, creating a slew of synthesisers based around the concept, including the popular DX7.
Their NS-10M monitor speakers were ubiquitous in studios.
Yamaha: DX7 | DX21 | DX21 guide | NS-10M | TX81Z