All of the can be played on piano and have piano acompaniements.
The question is too broad. There are many different books for piano with many different combinations of ABBA songs.
4 guitar vs piano 1,1.2,2, and 3
George M. Cohan wrote 1,500 songs!
A clavinova piano is a digital piano created by Yamaha. They are similar to an acoustic piano but the have many features such as the possibility to save songs. All piano stores sell these models.
Easy, go to classpiano.com. They have many songs like that.
im am pretty sure all of them
George Gershwin wrote many well-known songs, such as "Someone to Watch Over Me" and "I Got Rhythm." His most famous work, however, is Rhapsody In Blue, originally for solo piano and jazz band but more famously orchestrated by Ferde Grofé for solo piano and full orchestra .
Wolfgang Amadeus Mozart wrote many Piano Sonatas, Concertos, Duets, Trios, etc. There are probably anywhere between 200-300 piano pieces written by Mozart.
thousands by the haystack
With the Beatles, George sang popular songs such as "Here Comes the Sun", "While My Guitar Gently Weeps", many many good songs.
There are many places where one could listen to sad piano songs online. One could check online video sharing sites such as Youtube for listening to this type of music.