When I was 7 years old, I had just begun to learn how to play the piano. My piano teacher, Mrs. Permison, taught me a few often used mnemonic devices to help me read and remember notes on the treble- and bass-clefs. Here is a humble ASCII representation of both clefs, with an explanation near the bottom:

     |\
|----| )--------------------------------------------F---
|    |/                     E
|----/------------------------------------------D-------
|   /|                  C
|--/-|--------------------------------------B-----------
| /  |\             A
|/--(|,\--------------------------------G---------------
||   - |        F
| \__|_/----------------------------E-------------------
|    |      D                   
|  (_|                         -C-
|       B
|---------------------------A---------------------------
|  ____                                         G
|-/----\-.--------------F-------------------------------
| |     \                                   E
|--\----|.----------D-----------------------------------
|   \) /                                C  
|-----/---------B---------------------------------------
|  \_/                              A                  
|-----------G-------------------------------------------
The treble clef notes can be remembered as thus:
For the notes on the lines:
Every Good Boy Does Fine.
For the notes between the lines:
"FACE"

The bass clef notes can be remembered as thus:
For the notes on the lines:
Good Boys Do Fine Always.
For the notes between the lines:
All Cows Eat Grass.