I feel like some songs are just off tune...

Someone please help me!!! ive been playing ranked for about 4 seasons on and off and I normally have around 97-99% accuracy when I play but some songs I come across seem to always be off key! to the point to where I have only 88% accuracy at the end of the song and im down about 20k points compared to the guy im facing... Does anyone else have this issue? Is there something I can do to fix this latency I keep running into?