There are a few main ways in the modern world that succesful artists promote themselves in terms of upcoming or already released songs. Advertising on social platforms such as instagram, youtube, facebook etc are one of the most frequently used amd frequently effective ways that artists promote themselves. They can also get adverts put on tv and movies for them as well. RAdio adverts and posters/billboards are a way of prmoting that artists use as well.

in terms of the adverts themselves, the content of them usually is a short video showing the artist or a music video with their selected song playing in the background, their adverts may also contain captions such as "insert song name" by said artist OUT NOW or RELEASING on insert date.

the artists engage their audience online, mainly by keeping their social media acounts frequently up to date with content of their work and updates on what they are up to, as well as trying to be as audience interactive as possible, whether thats by simply replying to comments or giving fans online unique oportunities to meet them, come back stage, win signed items or anything along those lines.

I think that having to work isolated from each other prevented many small things such as communication, and showing eachother our ideas and parts quickly and effectively.