curious, what is it?
Good question. If not 'Hallelujah', then what is the highest praise we can shout unto God?
Not to sidetrack things too far, but hallelujah is literally a command or exhortation to praise God. It's like me shouting "Shut the door!!" and instead of shutting the door, you holler back at me " Shut the door!" So, what we are doing is shouting, "You, praise God!" to each other. From Wikipedia, "Hallelujah, also spelled halleluiah, halleluyah, and the Greek and Latin form alleluia are transliterations of the Hebrew word הללו יה (Modern halleluya, Tiberian halləlûyāh) meaning "Praise ye Yah" or "Praise Jah, you people"."
As to what is really the "Highest Praise", I am not sure. It may be that for us humans, simple obedience is the highest praise. However, as far as I can tell, the highest praise mentioned in scripture is found Revelation 4:1-9. I don't think praise gets higher than that!!