"Less that it's a favorite and more that it's easy to remember. It's essentially a short teaching song for the runes, after all. Before when I sang it, you were asking for examples of what our songs are like and I gave you that and a lullaby. Here, it was to aid in your learning. Would you prefer something else?" Loki wouldn't mind singing again honestly. Eilonwy was good company, and respected him. Seemed to value him and his talents too, and that went a long way in his eyes. Not just in satisfying his ego either.