John Gills Exposition of the Bible Commentary - Psalms 150:3
Praise him with the sound of the trumpet ,.... Which was used in calling the assembly together, for worship and on other occasions; and at the feast of blowing of trumpets, and in the year of jubilee, Numbers 10:1 ; and by the priests in temple service, 1 Chronicles 16:6 ; and was typical of the Gospel, which gives a certain and joyful sound, and is the cause and means of praising God, Isaiah 27:13 ; praise him with the psaltery ; to which psalms were sung; and harp ; which... read more
Matthew Henry's Complete Commentary - Psalms 150:1-6
We are here, with the greatest earnestness imaginable, excited to praise God; if, as some suppose, this psalm was primarily intended for the Levites, to stir them up to do their office in the house of the Lord, as singers and players on instruments, yet we must take it as speaking to us, who are made to our God spiritual priests. And the repeated inculcating of the call thus intimates that it is a great and necessary duty, a duty which we should be much employed and much enlarged in, but which... read more