I am working on trying to harmonize a tenor and bassline part in 4 part writing and I really like the way they sound together so far but the initial chord I had in mind for this bar was Fm/Ab which would work nicely for the 1st notes but then the bassline changes to compliment the vocal part and I am unsure if I should change the harmony half way through the bar or could the same harmony be used throughout the bar? Does the answer perhaps depend on what the other two voices are doing and where they will be placed? If so, could someone give me an idea or two about how to take the next step here? Lets say I use the next chord over the first of the two quick 16th notes, then should the harmony change there for example or could it be left with the same two top notes? Again, just looking for suggestions and ideas on how to take the next step.