I don't think that instruments are evil, but that it depends on how it is used, because music can also be inspirational and uplifting, when it is positive and puts out truthful messages. I used to play instruments as well, and it always felt like being able to do that was a gift that is meant to help bring joy. So, I think it just depends on how it is used and what effect it has. Also, scripture does not anywhere prohibit musical instruments from what I've read. I know there is a place in the Bible where people's use of instruments was spoken about negatively (they made instruments like David), but as I read it it was because they used this to amuse themselves while they were not listening to God's Warnings, to repent of their sins. So to me what made sense that it meant that to them, because of what they were being like, it because of their own deeds served as a willful distraction. They used musical instruments as a method to deafen themselves to God's Guidance and were ignoring Him. So, that then became a snare that they made for themselves. But, it could probably also be like that with almost anything. However, there are also instances in Scripture where music was used in positive ways (like when David played the harp to help calm down Saul) and people had uplifting and inspirational / positive songs. I do like music with positive lyrics, that I can listen to. But when something is evil, you can feel it and that it's not good to listen to it, so that should then logically be avoided. I believe it's probably just up to how we decide to make use of our free-will, that will determine if the outcome it will be good or evil.
A song can also get stuck in one's head after having heard it, so that can go either way. If it's positive, it can have a positive effect. But the reverse is also true, that if negative then the effect is going to be negative, or at the very least annoying. We know that satan loves to invert and subvert every good idea that is out there. But satan can only be successful because people allow it or when they are on his side.
I know some people believe that music is completely haram, probably based on certain hadiths. Maybe because of that, to them (or anyone of like mind) it is better to avoid it for the sake of their conscience. But, I also don't think I know what the total answer is and could be wrong. If instruments are indeed "somewhat evil", then I don't understand why God gives people the gift to be able to make music (or musical instruments). Cars for instance can then probably be considered to be "evil" too, if everyone that drives them cause harm to others by their doing so. So, I feel like it is therefore probably up to us, and how we choose to use cars as an example.