Tips for Playing Both Hands Together on the Piano
Playing the piano with both hands together, is considerably more difficult than just right-hand playing. But no matter how much you enjoy playing melodies with the right and left hands separately, the time comes when you have to get these two great friends together.
You have several things to keep in mind when you attempt to play songs hands-together:
When playing music from the grand staff, read the notes vertically (bottom to top) before moving on horizontally (left to right).
Play the song a couple of times with the right hand by itself. Then play the song a few times with the left hand only. When you’re confident with the notes for each hand, you can try playing the song hands-together.
Play slowly at first and speed up the tempo as you become more comfortable with the song.
Be patient and calm.
Ask listeners to leave for a while and allow you a chance to practice. Invite them in for the concert after you feel good about your playing.
Start reading from the grand staff by passing a melody between your hands. When Johnny Comes Marching Home starts in the left hand, and the right hand takes over as it climbs into a higher range:

The melody can carry from left to right - hands, that is.
Go over the note names once or twice before you play in order to get comfortable recognizing all the notes and switching between the bass and treble clefs. Then you can make an easier transition to the piano.

Piano Glossary
accidental
A sharp or flat not in the key signature.

Piano Glossary
bar line
A line that divides music into measures, breaking up the musical paragraph into smaller, measurable groups of notes and rests.

Piano Glossary
bass clef
A musical symbol that indicates lower the notes, generally played with the left hand.

Piano Glossary
beat
The steady pulse of a piece of music; what you tap your foot to.

Piano Glossary
C position
Placing your right-hand thumb on middle C and your other right-hand fingers on the four successive white keys.

Piano Glossary
chord
Three or more notes played at the same time.

Piano Glossary
Circle of Fifths
An order that starts with no sharps and flats and cycles the ring of keys to all 12 keys.

Piano Glossary
clef
A musical symbol that tells you the names of the lines and spaces on the staff.

Piano Glossary
fingerings
Numbers written above the notes that tell you which finger to use for each note.

Piano Glossary
G position
Placing your right hand on the G above middle C and your other right-hand fingers on the four successive white keys.

Piano Glossary
grand piano
The largest piano. A concert grand is 9 feet long; a baby grand is about 5 feet.

Piano Glossary
grand staff
The treble clef and bass clef joined together with a brace at the start of the left side.

Piano Glossary
home note
The base note of a piece of music. All the notes in a song have a relation to the home note based on how close or far they are to home.

Piano Glossary
interval
The distance between any two musical notes.

Piano Glossary
key
A set of notes that corresponds to a certain scale.

Piano Glossary
key signature
Notation placed just after the clef on every line of music to tell the performer what key the song is in.

Piano Glossary
ledger line
An imaginary line running above or below the staff, extending the five-line staff to represent notes above and below the staff.

Piano Glossary
measure or bar
A batch of notes with a specific number of beats — most commonly four beats — that helps a performer keep time.

Piano Glossary
middle C
The 40th key of a piano, close to the center of the keyboard. The first key a new pianist learns the placement of.

Piano Glossary
MIDI Musical Instrument Digital Interface
A device that allows communication between electronic, digital equipment.

Piano Glossary
notehead
The printed representation of a note. A notehead is oval and may be solid or open, an attached to a stem or not.

Piano Glossary
octave line or ottava line
The line that tells you to play the indicated note or notes an octave higher or lower than written.

Piano Glossary
root note
The lowest note of a chord.

Piano Glossary
scale
A series of notes in a specific, consecutive order.

Piano Glossary
staff
The five lines and four spaces music is written on.

Piano Glossary
tempo
How fast or slow the beat is.

Piano Glossary
time signature
The indication of the meter of a piece of music.

Piano Glossary
tonic
The bottom note of a scale.

Piano Glossary
treble clef
A musical symbol that indicates higher the notes, generally played with the right hand.

Piano Glossary
triplet
Three notes per beat.

Piano Glossary
upright piano
A piano that sits upright against a wall. Also called verticals, they vary in height from the spinet up to full-size uprights.