1. Check Music Player
2. Please avoid doing replacement in this case as this might be subjective in most of the cases
a) Ensure if user is listening downloaded song/Online APP song or Youtube Song. Note- Youtube songs quality may be lower than the Online APP or downloaded song quality
b) Listen the same song through different mobile phone
c) Use different Music Player
Tip: An equalizer (also called an "EQ") is an audio filter that isolates certain frequencies and either boosts them, lowers them, or leaves them unchanged. Equalizers are found on a wide array of mobile devices.
An equalizer will adjust audio output so that certain frequencies are emphasized over others.
Recommend customer to try a different equalizer setting. If this doesn't work, proceed with the next step
d) Check Streaming quality