Pied Piper (5e Class Feature)
From D&D Wiki
At 6th rather than learning to subvert charm you instead focus on embracing charm. At 6th you can take this instead of Countercharm. Instead of every creature within 30 feet of you having advantage against being charmed you can use this song to make creatures within 30 feet of you roll a Wisdom saving throw to avoid being charmed for every round you continue playing through, each round has an independent save so the charm only takes effect if they fail their save for that round. This song still uses your action to play and can be stopped without using an action.