OK, I'll help Mr. Giffen crowdsource his harmonization :-) If you're persnickety about direct intervals in outer voices, this probably isn't for you. The middle phrase is a little bland. Originally the bass line in m.5 ended B-C#, but the direct motion to a doubled 3rd offended my ear. I tried having the alto sing an A in the final chord, but I've never liked that voice-leading gambit, and the Eb makes it even worse.
Salieri, didn't you change the melody at the end of m.7?
I'll make an attempt at this sooner or later. JQ snatched a few ideas from me, so I'll have to go another route. Maybe I shouldn't look at anyone's harmonization until I've done mine.
I thought I would demonstrate how I compose a four part harmonization with this post. First I add the figured bass. (figured bass is now dictating harmonic structure). Then I add the alto. The SAB needs to contain a complete harmony in itself and must stand artistically on its own merit. The SATB just adds color to existing SAB. Forgive me Charles... I adjusted the melody so that it artistically fit to a two and three part counterpoint excersize. I believe the SATB holds your melody in tact.
Here's mine, in PDF format and as a MIDI file. [I've cleaned up the PDF, so the new files correspond to each other. I finished, in the end, with a c-natural on the 2nd beat (in the bass) and an open chord at the end.]
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