There are two ways to change the pitch of a harp:
1. change the pitch of an individual string using a tuning key
2. change all strings in the same pitch class (i.e. all D's, all B's, all G's) to one half step higher or lower using pedals (on a pedal/orchestral harp) or levers (on a lever harp)
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harp
The Harp
There are many different sizes and styles of harp. Typically the larger ones, like in a symphony orchestra, do have pedals while smaller ones do not. The pedals facilitate a wider range of notes than what you could get without them.
The harp player plucks a string and it vibrates at a certain frequency, depending on the length of the string. The shorter the string, the higher the pitch. The volume can be determined on how hard the string is plucked. The harp is made of wood because wood resonates well. A pedal can be attached in order to make each string higher by shortening it by a certain amount.