An online piano tool serves multiple purposes in music practice. It offers a great way to learn and practice chords, allowing users to select and listen to them while building a solid understanding of chord recognition and playing techniques. Additionally, it supports ear training, a critical skill for musicians, by helping users identify and replicate musical notes and chords—key for improvisation and playing by ear. This tool enhances the learning process by making it more engaging, interactive, and educational, ultimately aiding in the development of essential music skills.