The answer to this puzzle is:

>! **W. AMADEUS. M** - a famous *class(ical)* [composer](https://en.wikipedia.org/wiki/Wolfgang_Amadeus_Mozart).

**Puzzle 1:**

To solve this, note that FRA and GIN are:

>! 3-letter country abbreviations for **France** and **Guinea**. These two countries have triband flags, France's being blue-white-red and Guinea's being red-yellow-green. If we join these coloured dots in this order, we see a '**W**' traced out:  
>!  
>! [![enter image description here][1]][1]

**Puzzle 2:**

The moon and sun icons here have connotations with:

>! *Monday* and *Sunday* (these days of the week are named after them). Note then that beneath these symbols we have *seven* rows of boxes. Moreover, the number of boxes in these rows correspond to the number of letters in the names of the *seven* days of the week in English.  
>!  
>! Note next that each 'thumbs-up' bullet point is surrounded by a number of bars. Count these up and index into the corresponding day of the week to extract a letter. This yields:  
>!  
>! **M**ONDAY, TUE**S**DAY, W**E**DNESDAY, TH**U**RSDAY, FRI**D**AY, SATURD**A**Y and SUND**A**Y.  
>!  
>! Together, this gives the letter set MSEUDAA, which is an anagram of **AMADEUS**.  
>!  
>! [![enter image description here][2]][2]

**Puzzle 3:**

This is a rebus of sorts that requires a few steps to it:

>! Here, 'Pr' represents 'prime'. The 9th prime (indicated by the substring '9') is 23. The 23rd letter of the English alphabet is 'W', and rotating this 180 degrees (as suggested by the arrow) turns our 'W' into an '**M**'.  
>! <sub>*This explanation clarified in comments by the OP, below, following my initial chemistry-connected suggestion neglected to use a part of the rebus.*</sub>


  [1]: https://i.sstatic.net/VbpsL.png
  [2]: https://i.sstatic.net/NYdMd.png