"Goodbye" is a song by Kesha, which talks about letting go of a toxic relationship and finding the strength to move on. It is an emotional ballad with a slow tempo, accompanied by simple guitar chords that anyone can easily play. In the lyrics, the singer reflects on the pain and heartache she suffered in her past relationship, but also acknowledges the growth and wisdom she gained from it. The song is a reminder that goodbyes can be difficult, but they are sometimes necessary for our own mental and emotional well-being. If you're looking for a song to play on the guitar that speaks to the heart, "Goodbye" by Kesha is a great option.