rj-action-library/Runtime/Actions/Audio/PlayMusic.cs

using Godot;
using System.Collections.Generic;

namespace Rokojori
{  
  [Tool][GlobalClass]
  public partial class PlayMusic:Action
  {
    [Export]
    public AudioStreamPlayer music;

    [Export]
    public bool stopSiblingPlayers = false;
    
    protected override void _OnTrigger()
    {
      if ( stopSiblingPlayers )
      {
        GetParent().ForEachDirectChild<AudioStreamPlayer>(
          ( p )=>
          {
            if ( p == music )
            {
              return;
            }

            p.Stop();
          }
        );
      }

      music.Play();
    }
  }
}