piper

pip|er /p'aɪpər/ (pipers)
1 [N-COUNT]
A piper is a musician who plays the bagpipes.
2 [PHRASE]
If you say `He who pays the piper' or `He who pays the piper calls the tune', you mean that the person who provides the money for something decides what will be done, or has a right to decide what will be done.