Apparently a Song of Degrees in Pslams means a Psalm that was to be used by the Hebrews as they ascended the road to attend the 3 pilgrrim festivals each year.
Three times in a year shall all thy males appear before the LORD thy God in the
place which He shall choose;
on the feast of unleavened bread,
and on the feast
of weeks, (known as Pentecost)
and on the feast of tabernacles;
Deuteronomy 16:16
[[A Song of degrees.]]
They that trust in the LORD shall be as mount Zion,
which cannot be removed, but abideth for ever.
As the mountains are round about Jerusalem,
so the LORD is round about his
people from henceforth even for ever.
For the rod of the wicked shall not rest upon the lot of the righteous;
lest the
righteous put forth their hands unto iniquity.
Pslam 125:1-3