“Sing Kinderlieder” is a great channel on Youtube that features German children songs. You can subscribe to their channel. Ella and I have been listening to the songs a lot—while nursing, while riding in the car, while playing. Now that she is a bit older she also likes the videos they create for each song. Plus, if it has been a while since you sang the songs as a child or if you simply don’t know the lyrics, each video conveniently features the lyrics for the song as subtitles.