John Gill Commentary 1 Kings 1:40

"And all the people came up after him, and the people piped with pipes, and rejoiced with great joy, so that the earth rent with the sound of them." — 1 Kings 1:40 (ASV)

And all the people came up after him
Following him from the fountain to the city, with their loud acclamations:

and the people piped with pipes ;
which were hollow instruments, and full of holes which they blew with their mouths, and upon with their fingers; Jarchi says they were and very probably:

and rejoiced with great joy ;
which they expressed by such loud shouts:

so that the earth rent with the sound thereof ;
an hyperbolical expression, showing the great numbers gathered together on this occasion, and the sonorous acclamations they made.