Hi Bassic
I,m a cello player. I also make them and enhance them via art and physics.
I do many songs from the 30's and 40's.

The cello can do any line ; bass tenor alto and soprano so its up to you how to orchestrate. Look up a 'church bass' and you will get more insights to cello lines.

In the 70's ELO and Boston used cello but today almost all music from the Dixie Chicks to James Taylor has cello.
Google Apocolypto/cello quartet.

Since the cello is tuned just like a mandolin I have found that gaining expertise in pizzicato technique adds lots of flavor.

Right now I am playing a Nicola Amati cello which is golden mellow.
The repaired damage of the last several centuries (perhaps in the Napoleanic Wars) required 20% of the Spruce to be replaced but we all get injured by time.

You can ask me specific questions via PM.