The stems of the tenor voice must point up and those of the basso voice down in order to optically display, that it is a two voice staff; this is notation rule. However, if tenor and basso follow the same rhythmic pattern, you can just write both voices as intervals. Claudio If you wish to unsubscribe, send a blank message with the single word, unsubscribe - in the Subject line to: sib-access-request@xxxxxxxxxxxxx