Yamaha offers a 31-day free trial of the Vocaloid 6 Editor. This trial includes a limited voicebank called It is a male pop voice with a limited range. It is the only official free Vocaloid voicebank in existence. It is perfect for learning the piano roll interface.
VOCALOID Voice Bank List Page 1/2 | Yamaha Corporation - VOCALOID vocaloid voicebanks free
However, a vibrant ecosystem of free voicebanks exists for (via the VSQ/VPR format) and, more prominently, for independent synthesizers like UTAU and Synthesizer V Basic. This paper clarifies these distinctions and provides a practical guide to freely available synthetic singing voices. Yamaha offers a 31-day free trial of the Vocaloid 6 Editor