| "A song of thanks: Shout to HaShem all the earth" (Tehillim 100).
Our Sages reveal that in the Messianic days all other songs of praise will be withdrawn except for "A song of thanks," Tehillim 100. What is the uniqueness of this Psalm? The phrase "all the earth" unlocks the secret of the song. In the Messianic days, all the people of the earth will join together to serve HaShem! At that time, people who stray from the good path, will ultimately return to HaShem. On that merit, HaShem will show them new levels of mercy and forgiveness. Upon recognizing the miracle of HaShem's compassion, all the people of the earth will be moved to sing to HaShem. What song will fill their heart, "A song of thanks: Shout to HaShem all the earth"!
The song of all the people of the earth joining together to praise HaShem, is far greater than the inspirational song of any individual or group.
When you say "A song of thanks" in your morning prayers, sing it with a tune. Envision all humankind joining you in singing this holy song. Let the joy of this song fill your heart with happiness throughout the entire day. (Based on the commentary of the Chayei Adam, and Rav Elyashev)
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