A few days ago I attended a small church meeting at a school. They had two keyboards and a guitar and live playing during the songs. This small group of maybe 25 people, with two of them leading the singing on microphones, blew away anything thing I'd ever heard at a jw meeting in 30 years of attending. The spirit imbued by live instrumentation far outdoes any of the canned, pre-recorded sound at the KH. It promotes a spontaneity that I had never heard during jw worship.
Two decades ago at the KH, we had a sister who played piano and we sang to that. A CO came through, instructed the elders to remove her from playing, and instituted singing only to cassette tapes. One more evidence at that time of the complete squashing of anything spontaneous in favor of strict, top-down control.