The software used for music production may vary from user to user based on features, pricing, user interface, etc. the top 5 Music Production Software are:-

Ableton Live

FL: Studio

Logic Pro

Apple Garage Band

Avid Pro tools

Developer Cost - To create software of this calibre developers have to put a considerably large amount of time and money into it, and developers have to profit from it as well.

Creation of sellable songs - DAWs are used to create songs that are then sold, so by producing sellable songs you have a chance to make money and make a profit. There are rarely going to be free opportunities to create something that can later be sold.

Supply and Demand -  the fact that fewer people are investing in DAWS than, say, office software, leads to price increases. As the market is smaller, fewer copies of the software will be sold, making the price appear more expensive in comparison.

High Standards - you can expect to pay high prices for industry-standard software. Quality, reliability, and features come at a cost, but some hidden gems can be found for a much lower price.

All-in-one - DAW software allows you to access pretty much everything you would need to create a track. As soon as you turn on your computer or laptop, you can begin creating. Besides being convenient and powerful, it's flexible as well

Music production software allows users to compose music, record digitally and produce electronic music among other uses. People who aren't attached to traditional musical instruments can re-create or perform music in ways they hadn't seen before with music production software.