Synthesizer/ˈsɪnθəsaɪzər/ Definition 1 of 4Pro Tip 1/3Genre Flexibility Synthesizers are versatile and used in many music genres, from pop to techno. Synthesizers are crucial in electronic music production. Pro Tip 2/3Not Always Keyboards While many synthesizers have keyboards, some are module-based, without keys. He connected modules to his synthesizer for new sounds. Pro Tip 3/3Sound Creation Synthesizers can mimic other instruments or create entirely new sounds. Her synthesizer perfectly imitated a grand piano.