Original sentence: It can be informal and just for pleasure, for example, singing in the shower; or it can be very formal, such as singing done professionally in a performance or in a recording studio.Many people consider the ability to sing to be a learned skill
Edited sentence: In our enlightened times, singing is by many considered to be a learned skill.It can be informal and just for pleasure (for example in the shower), or very formal, such as singing done professionally in a performance or in a recording studio