gistfile1.txt

{
    "_id" : "ZFntLRdps3fcieF3z",
    "emails" : [ 
        {
            "address" : "[email protected]",
            "verified" : false
        }
    ],
    "artists" : [ 
        "H5DHAcghzRHHYi8QF", 
        "om4bEKg6GYa6xNL7S", 
        "spJRpXETLnwY4T2Sz"
    ]
}

Template.access.helpers({
    users: function () {
      var users = Meteor.users.find({artists: 'spJRpXETLnwY4T2Sz'});
      return users;
    }
  });