Quarter note + quarter note + quarter note

When written in musical notation, a quarter note + quarter note + quarter note would be written as:

```
| 1/4 note | 1/4 note | 1/4 note |
```

To add three quarter notes together, you can simply add the individual durations.

A quarter note is typically given the duration of one beat in a 4/4 time signature.

So, if we add three quarter notes together, it would be:

1 beat (quarter note) + 1 beat (quarter note) + 1 beat (quarter note) = 3 beats

Therefore, three quarter notes played consecutively would amount to a total of 3 beats in duration.

When you see a combination of three quarter notes, it means that you have three beats in a measure. In musical notation, a quarter note is typically represented by a solid black notehead with a stem. To understand how the combination of quarter notes would sound, you need to know the time signature.

A time signature consists of two numbers written at the beginning of a musical staff. The top number indicates the number of beats in a measure, while the bottom number tells you the type of note that receives one beat. In this case, the bottom number will be "4" because we are dealing with quarter notes.

For example, if you see a time signature of 4/4, it means there are four beats in a measure, and a quarter note gets one beat. With a combination of three quarter notes (each one getting one beat), you would count "1, 2, 3" to match each note.

However, if the time signature is different, such as 3/4 or 6/8, the number of beats in a measure and the way you count the notes may vary. So, always take into consideration the time signature when interpreting rhythmic combinations.