Sing unto God, sing praises to his Name (comp. Psalms 64:4): extol him that rideth upon the heavens. This passage is now generally translated, Cast up a highway for him that rideth through the deserts (Hengstenberg, Kay, Dean Johnson, Professor Cheyne, Revised Version).
The image is that of a king travelling through a waste, for whom a way was made beforehand (comp. Isaiah 40:3; Isaiah 49:11). By his name Jah; rather, Jah is his Name. "Jah"—the shortened form of "Jehovah"—occurs first in the Song of Moses (Exodus 15:2).
It is repeated here in Psalms 68:18, and recurs in Isaiah 26:4. Dr. Kay suggests that "it represents the concentration of God's redeeming power and love." And rejoice before him (comp. Isaiah 26:3).