English: till for until?

Tutoring English, everyday usage is interesting. The tutor mentions till.

The 80s band ‘Til Tuesday spelled their name that way, but could it properly have been Till Tuesday, as well?

Yes: apparently, till is a proper word meaning until.

Source:

Mish, Frederick C. (editor). The Merriam-Webster Dictionary. Springfield: Merriam-Webster, 2004.

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.