Who says bass can't play or sing? As long as you are busy, guitarists, keyboards, bassists and drummers can all sing. It's just that bass players seldom sing. Simmons of KISS is a singing bass player. There are several bands where all the members take turns singing!

Of course, a bass solo is also acceptable. You can check the videos of practicing in hell online. This is a perverted bass course, and the author is playing solo. There are few opportunities for bass solo in the band performance, because bass is difficult to stir the atmosphere, but it is not necessary. The fencing of Tai Chi is an example. Beth Solo stood naked in the red pepper rain.