I cannot choose just one favourite anime, there are dozens that I like a lot and I cannot put one above the rest: "Evangelion", "Cowboy Bebop", "Ghost in the Shell", "Bakemonogatari", "Mononoke Hime", "Monster", "Full Metal Alchemist", Steins;Gate", "Parasyte", "Psycho-Pass", "Fate/Zero", "Tengen Toppa Gurren Lagann", "Your Name", "Silent Voice", ... sonnerie Nokia Tune Harmonica
Same problem when it comes to manga.
Nouvelle Sonnerie: https://sonneriestelephone.com/nouvelles-sonneries/