Level Up (A5E) Do Battle Hymns count as Bards Spells?

[DerDoktory]

When you pick the Art Speciality "Voice" you get advantage on maintaining concentration on bards spells. Does this count for the Battle Hymns as well?
And if not: Does a Feat like "Warcaster" or "Battlecaster" work with battle Hymns?

 

[Morrus]

Hymns are not spells, no. Anything that is a spell is clearly indicated as such.