The purpose of this research study is to define the time a molecule in the participants bones called NTX begins to rise after receiving treatment with bisphosphonates. NTX is measured in the urine to determine the rate of bone breakdown. Tracking this marker may help identify a more optimal dosing schedule of bisphosphonate therapy. Bisphosphonate drugs like zoledronic acid, which will be used in this study, are used to reduce pain and bone fractures in people with multiple myeloma. There is some laboratory data to suggest that they may work against myeloma. Participants will have already undergone bisphosphonate therapy and may have received zoledronic acid as treatment. Typically these agents are continued indefinitely. Due to concerns of their long-term side effects we are looking at alternate strategies for reducing the frequency of these agents.