Time Signature in Sheet Music

Learning to read and understand sheet music can be quite daunting for a beginner guitarist, especially if you are used to relying on chord diagrams or tablature.

Although it looks complicated, sheet music is designed to convey the essential information a musician needs to play a piece of music, at a glance.

Once you know what all the symbols and notation means on sheet music, you will appreciate its value. One of the important concepts that sheet music conveys, is the time signature of the music piece you are learning.

What exactly is the time signature?

The time signature of a piece of music, indicates how the notes are grouped together, and it offers you a general idea of what the strong beats are in the song. This allows you to work out your rhythm, and a natural strumming motion. It also hints at when the chords change in the song. The beats are never set in stone though, and the time signature is merely an indication of what kind of notes and beats the song has.

Time signature in sheet music is always found at the beginning of the song, or at some point when the time signature changes during the song. One song may go through several different time signatures, as well as key changes. The time signature consists of two numbers, or a symbol. It appears on the upper left corner of the sheet music page, preceded by the cleff symbol and the key signature.

How to interpret the time signature

In sheet music, the time signature will have one number above the other, or if the values are the same, the time signature may comply with a convention that allows for the use of a symbol instead. The number at the bottom of the time signature, indicates the length of the basic note that forms the 'pulse' of the beat. 

The higher the value of the bottom number of the time signature, the shorter the length of the pulse note is. For example, if the bottom number is “4” then the pulse notes are 'quarter notes' or 'crotchets'.

The top number of a time signature indicates how many pulse notes there are per group of beats. Thus, if the time signature is 3 over 4, then the beat grouping consists of three crotchets, or quarter notes. This particular time signature is often used in waltzes, with the emphasis on the first note. 

Most of the pop, dance and rock music that is heard on the radio, or music shows, has a 4 over 4 time signature. This time signature used to be used for marches, but also lends itself to dance music and most modern guitar music. Due to its frequent use, it became known as “common time” and is sometimes denoted as a lower case “c”, instead of 4 over 4. In the Sixteenth century, the “c” stood for “imperfect time” and it symbolized a time signature of 2 over 4.

Another symbol you might come across when seeing time signatures in sheet music, is a lower case “c” with a single vertical line through it. This stands for “cut time”, known as “alla breve”, and it represents a time signature of 2 over 2. This means the beat grouping consists of two half notes, or semi-breves.

In sheet music notation, the time signature is also illustrated by the vertical lines, which split the song into bars. Each bar contains the note groups indicated by the time signature.