This Psalm is long, and when I read it I saw three fairly over sections. Also, it has a pleading tone, which made me think of the blues. So, I split the psalm into three sections and roughly the harmony, at least the bass line, corresponds with the three harmonic sections of a twelve bar blues. However, the psalmist doesn't seem to be on sure footing. There is a liminal or unsure tone to the psalmist's pleas. To represent this harmonically I used a lot of parallel motion or so-called "chord planing" a la Revel's impressionistic music.