An unsatisfied soul always tends to lead an individual towards jealousy, it's common human nature and many individuals are not ready to accept the reality of life, even they can't easily accept other's success. I feel this is a common tendency among humans. Only a positive mindset can help in this case.

Artcell is one of my favorite bands and Linkon is the best. Your voice is really great and hopefully, in the future, we will see many cover songs from you...