Sheet Music is the traditional way to read and write music, this is a sample of music, it represents the music scale, each line represents the note and each symbol is the timing. The lower lines are low notes the higher lines are high notes(there is a bass clef and a treble clef, we will stick with the treble clef). The middle C and higher are represented on the treble clef.
This is a whole note, you play it once for everytime you count to four, 1-2-3-4. This is the Longest note Represented on the scale. It is note used very often but when it is used it is typically used for a chord, this can be a great way to add depth to your music. One off my favorite things to do with a whole note is to form a chord and then about half way through it hammer-on a half note this can make a beautiful chord ( or it could be one of the worst things you have ever done).
This is a half note, you play it twice everytime you count to 4, 1-2-3-4. This is the second largest note represented note on the scale. It is a little bit more practical than a whole note, I still would use this with a chord but you can do what ever you want with it. you only play this twice per beat so it is still rather long but that's alright because you can still use very frequently.
Here's a list of a few songs for sheet music