There are a few that come to mind from the sacred to the modern and very much in between!

Sacred: Old 100th.

In between would include a lot by Burns, eg 'Hielan Laddie, Scots Wha Hae, Braw Braw Lads, Ye Jacobites By Name, to mention a few.

Modern stuff like Runrig's Hearts of Olden Glory, Pride of Summer, and Alba, in fact a lot of their earlier less commercial stuff.

Pipe/Miltary tunes like The Dark Island, Black Bear, Blue Bonnets oe'er the Border.

Even non Scottish specific, eg. Hearts of Oak, Dambusters March etc.