If you stay in Japan for longer than a holiday, you might get into the situation of searching something specific but not finding it in this huge city! Here is one tip for those, who are looking for:
a) All kind of Guitars & Violins
b) Snowboards, Skis and clothes as well as Bikes
Ochanomizu (so called Tee-water-street), close to Akihabara, might be your solution! Not far from the station you find a street where you can ONLY buy guitars!
Going further you end up on Yasukuni Dori, where one wintersports-shop is followed by the next! Floor by floor stuffed with skis, snowboard and everything else you need to survive the winter.
Be sure you have time when going there….