There have been various forms of musical notation at various times and in various cultures, but in the Western world musical notation is now standardised. For piano, music consists of two staves (the two horizontal rows of lines) and each line and space on the stave represents a note. The top row is the treble clef and represents the higher end of the keyboard, notes that will usually be played with the right hand. The bottom row is the bass clef, lower notes usually played with the left hand. The shape of the note on the clef describes its length. Other symbols represent pauses, the manner in which notes should be played, and sharps and flats.