The beads hold intrinsic value, and they are beautiful to use devotionally. Certain beads are good for certain mantras. They can have rich histories and great importance. They hold individual purposes. For now, using knots is probably fine. If you feel led and romantically inclined out of bhakti, go ahead and buy some beads.
Cutting out music is an absolutely huge help. I know somebody who is somewhat addicted to music and listens to it all of the time. Cutting out music for him would help tremendously. Even for other people, lessening the amount of music that you hear can help a lot. I personally have now lost interest in most music. If you can, cut it down a bit. I still practice, play, and sometimes perform classical guitar with no problem.
May God Light your Path,