         static let imageKey = "image"
         static let locationKey = "location"
         static let colourKey = "colour"
+        static let replyToKey = "replyto"
     }
     
     func encode(with aCoder: NSCoder) {

        }
    }
    
    /// A uniqueish string title for the performance
    func title() -> String {
        let formatter = DateFormatter()
        formatter.dateFormat = "YYYY-MM-DD-HH-mm-SS"

    convenience override init() {
        // FIXME: actually detect the proper location
        let perfColour : UIColor = UIColor(hue: CGFloat(UserDefaults.standard.float(forKey: SettingsKeys.performerColourKey)), saturation: 1.0, brightness: 0.7, alpha: 1.0)
        self.init(data : [], date : Date(), performer : "", instrument : "", image : UIImage(), location: CLLocation.init(latitude: 90.0, longitude: 45.0), colour: perfColour.hexString(), replyto: "")
    }

    /// Returns a CSV of the current performance data
