Collections of traditional and nursery rhyme songs generally include favorites like "Mary Had a Little Lamb," "Twinkle, Twinkle Little Star," "Row, Row, Row Your Boat" and "Old MacDonald Had a Farm." These collections often include a hundred or more songs, which your little one will want to listen to over and over again. It's important to pick a collection that has some variety in how the songs are performed, like "150 Toddler Tunes featuring Sara Diamond" or "Raffi the Singable Songs Collection."
Nonsense songs are a big hit with kids. Anything goes with flying elephants or silly barnyard animals. Both of these are very entertaining and engaging: "Disney Silly Songs: 20 Simply Super Singable Silly Songs" and anything by Sandra Boynton, but especially "Philadelphia Chickens: A Too-Illogical Zoological Musical Revue" (book and cd set), will give your child hours of listening enjoyment.
Introducing young ones to great music can be a fun experience. "Beethoven's Wig; Sing Along Symphonies" adds comical lyrics to music by great composers. "Baby Einstein Playdate Fun" is another great choice for expanding your child's appreciation for musical variation.
Music can be a great way to introduce new languages and cultures to your child. Putumayo has several CD's that are enjoyable for children and their parents, including "World Playground" and "Jazz Playground."