Songwriting with the Yamaha Tyros5 Arranger Workstation
https://www.youtube.com/watch?v=eUW7ZSIJ4EE

The tyros 5 is perfect for professional song writing as well and found in many professional studios.

My Tyros 4 was bought by a studio in Toronto for Ethnic sound sample performances and pro recordings. The Studio technician specifically sought out a Tyros for it's quality, vast sample selection and reliability in this regard.

Marcus