Disrupting Note

Bard spell.  

You play a discordant note on your instrument aimed at a creature concentrating on a spell or effect within range. The target must make a Constitution saving throw. On failure, it looses concentration on the spell or effect and takes 2d6psychic damage.

At Higher Levels:
When you cast this spell using a spell slot of 3rd level or higher the target creature has disadvantage on their saving throw.