how to tune a piano

{"cid":"91091406","title":"37 Key Hotsale Grand Toy wooden piano Kid toy mini piano with stool W37","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/7e\/d2\/0a2890608f071c3f71725042fda5-200x200-1.jpg","attrs":{"Price":"FOB US$50~60","Brand Name":"AGOS\/OEM","Model Number":"W37","Minimum Order Quantity":"100 sets","Delivery Time":"25~35 days","Place of Origin":"China","Certification":"CE, ISO9001:2008, ASTM F963, EN71","Color":"White, black, green, yellow, orange, red, pink, blue and etc","Packing way":"5 layer brown box\/ OEM color box with extra cost","Packaging Details":"Shock-proof foam case","Payment Terms":"T\/T; L\/C"}}

{"cid":"91198874","title":"17 Keys Kalimba Thumb Piano Case","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/25\/2f\/7235872d68fe50782dc8567ee4a0-200x200-1.jpg","attrs":{"Price":"$1.2-2.5","Brand Name":"brilliant","Model Number":"bwlz024","Minimum Order Quantity":"500pcs","Delivery Time":"20-25 Days","Certification":"ISO9001\/ROHS\/REACH","Place of Origin":"China","Payment Terms":"L\/C, D\/A, D\/P, T\/T","Supply Ability":"30000pcs\/day","Packaging Details":"1 pc in opp bag, then 40pcs in carton","Material":"PU+EVA+Velvet","Inside Pockets":"Slit Pocket","Size":"230mm * 180mm * 75mm","Item Weight":"16 ounces","Color":"Black","Type":"Case,Storage Bag"}}