Spin command

I know that if I use the MMB I can spin the part around, if I hold SHIFT I can pan, and if I hold CTRL I can either zoom in and out or rotate the part on a forward facing axis.

I want to know if there is a way to spin the part on a vertical axis much like the way it spins with the CTRL button.

I tried googling it but all I come up is with people complaining about the zoom feature and all that.