Listen closely to "All My Life," concentrating on the nuances of the music. Observe the patterns of the notes, mentally marking where it goes up and down, which places it gets louder or softer (crescendo or decrescendo), and analyze the rhythm, noting where it breaks or changes.
Find guitar music so you can learn how to play "All My Life" on your piano using basic chords. The music for the guitar offers basic chords. You can add notes according to your comfort level and ability when you are ready.
Take a keyboard tutorial on the Internet. Popular video-viewing websites highlight commercial songs and teach songs such as "All My Life" in note-by-note and step-by-step tutorials.
Buy piano sheet music for "All My Life." You could purchase the music by going to a local music shop or by downloading the sheet music for "All My Life" off an Internet website.
Ask your piano teacher to help you learn "All My Life" on the piano. If you already take lessons, your teacher could guide you through the trickier key changes and musical phrases.
Study the time signature and key signature before you begin playing "All My Life" on the piano. Notice all sharps or flats. Browse through the sheet music and take note of all time and key changes you encounter.
Start playing the music at a slow pace. You will find yourself playing at regular speed after a bit of practice. At first, you want to focus only on the notes.
Practice playing "All My Life" on the piano by playing the song over and over. Cut the piece into sections, focusing on specific problematic measures as you practice.
Add dynamics and expression by playing quietly in some sections, according to the sheet music, and louder in others.
Continue rehearsing the sheet music until you are comfortable playing "All My Life" on the piano. Finalize your practice and fine-tune the piece when you can play it at a regular speed with very little error.