A meme is just a carrier for cultural symbols and ideas that takes the form of a recognisable entity and is passed around freely by a population. Something can be a meme even if it didn't start out as one, because things are adopted as memes by definition. Memes exist until they are pushed aside by the culture that created them for whatever reason.
Spongebob is a meme until Songebob memes go extinct. When he appears in the show and not in a meme he's a meme in a show. The show isn't a meme, but the character is.
Pink Guy made memes and then became a meme since he appears in memes. That character is now a meme, but not everything he is in is a meme. This is extremely basic memetics.
Like I said, I can link you any number of terrible "art" music videos, but it doesn't make them good videos.