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I tried finding a tool that would automate it for me sometime ago but didn't find it so I simply used excel. I took a list of all major US states and cities and imported to one row. On the right row I used keyword that I wanted to combine with the geo term. Copy pasted both rows (geo+keyword) to get search count.  It took me 20 mins to do it all. Also, if you select 'broad search' for  "music instrument rentals San Francisco" while finding the search count. you will get other search queries as well, like the one you mentioned:"Where to get Instrument rentals in San Francisco" + several other combinations