The premise of this drama is: "everyone can make music even if you're not professional as long as you have the originality and energy". This is referring to the usage of Apple GarageBand apps and the protagonist was portrayed as someone who's striving to create "Godly Song". She was inspired by Kawatani Enon (Indigo la End, Gesu no Kiwami Otome et al) who made a cameo in the drama.

Now the problem:
1. The drama didn't focus much on the music making process. Our protagonist can make a song on a whim (even when she can't play instrument) without much inspiration and brainstorming let alone the technical understanding.

2. However, the focus of the drama was more on forming a music group instead, and in this case a Jpop-Idol-like music group. Half of the series was about getting members to join. They eventually formed a school's club. They were also too concentrated on the performing aspect of their group rather than their music direction. Although most of them suck at dancing and singing.

3. The writer tried to make up the drama with the guitar girl character by throwing some technical jargon here and there in the script. Although their music wasn't guitar oriented at all and "guitar part" was very insignificant. The writer also randomly included Jpop artists name as reference in the script, just to make believe her drama is legit.

4. Not sure if the writer is an Apple "fanboi", but the drama felt like one with all the devices featured as well as the iMusic festival being mentioned in the drama. There were also plenty of Steve Jobs quotes in the script.

All in all, this is a typical JK (Joshi Kousei or High School Girls) drama about school's club and the relationship among members of the club. The usage of the term, DTM (desk top music) in the title was most probably an Apple thing and has no real impact on the main plot of this drama. What a click-bait!