Yes, if your ear can haer the harmony. Heres my example:
In C : melody......C, E, G, G......, F, E......D. D, E, F, E, D
This is the tune my faith looks up to thee, thou lamb of calvary.
Now is the basic choir chording to support the melody
soprano......C, E, G, G......, F, E......D, D, E,.. F, E, D
alto............G, C, E, D......, C, C......A, A, Db, D, C, B
tenor..........E, G, C, B......, A, G.....F, F, G,....A, A, G
Now this voicing is complete in sound but lacks the bass so lets add the fourth part.
soprano......C, E, G, G......, F, E......D, D, E,.. F, E, D
alto............G, C, E, D......, C, C......A, A, Db, D, C, B
tenor..........E, G, C, B......, A, G.....F, F, G,....A, A, G
bass...........C, A, E, G....., G, C.....D, D, Db,..D, D, G
Now we have complete four part harmony supporting the melody.
Of course this is a known tune so it was easy to place the parts in harmony. It's when you're writing an oringal tune is when your 'trained" ear tells you what sounds correct. Maybe we'll post a arranging excercise where a melody is posted and we'll see what harmony(s) we can come up with.
Sam