You can add alarm clock to your Google Chrome. In this case, you can enjoy surfing the Internet without not knowing the time. Of course, you can also set an alarm to remind you that time is up.

You have many voice, and the pitch may be lower or higher than you want, you can change voice pitch in Audacity.

When I was watching a video and had music playing while a person was talking in the video. How can I remove that person's voice so I can listen to the music more clearly.