Riddle of the Day

[Gizmokid2005]

I travel high and low....scale to the heights and then again travel back down. By reading the lines, I can be found. If you read between the lines, here you'll also find me around. Being familiar with the alphabet will help you to see that without me a lot of the world would be without sound. What am I?

ANSWER (Congrats acoustikarl): Musical Notes

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NEXT RIDDLE:

A man is pushing his car. He stops in front of a hotel and immediately knows he is bankrupt. How did he know?