These are the Music Apps rated four stars or more; there are 176 of them, so it should be easier to find the one you are looking for. Again, the vast majority are free.

Highest Rated Music Apps for Kindle Fire
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.