However, there are some websites that provide music that could be reused or used for projects like this.
The website called Musopen music provides free music that could be downloaded – however you can only download 5 music per day. It is free and on the website there is some info about copyrights and public domains. Link: https://musopen.org/music/
The internet archive also provides free music to be downloaded. You should be looking out and see the usage rights correctly to see if you can reuse it for free , as not everything on that webisite allows you to do so. Link: https://archive.org/details/audio
A good website to trust and use is Free Music Archive website. It provides good high quality music and it can be used for podcasts, videos and other digital presentations. Link: http://freemusicarchive.org/
To find recordings of common sounds like bell ringing or dog barking etc. you can record them yourself or find them on Sound Gator. You have to however register to be using these recordings and after that you can download and reuse them right away on your computer. Link: http://www.soundgator.com/