Here are my thoughts so far in the order I have made discoveries:
The first thing that struck me were the two numbers 29.9, -90, these were the only two numbers where they are separated with a comma. I am not sure if the punctuation was designed to separate the numbers or to be grouped together, perhaps as a form of co-ordinates.
I tried searching on Google Maps the coordinates 29.9°, -90° to find a retirement home in New Orleans. I don't think the particular building is of any significance but it seems like a big coincidence to come across a major city as opposed to an ocean/forest/desert.
New Orleans is world famous for it's music and has been heavily referenced in many song lyrics, famous for Jazz, R&B, Rock & Roll, etc...
The question is why 29.9°, -90? Why not a round number like 30, -90 or perhaps a more central part of New Orleans?
Meaning of 'Alternative'
The link to the Reddit discussion is about looking at something differently, an alternative perspective.
I believe the use of the word alternative in both the title and body of the puzzle is a clue as to how someone should be thinking about the puzzle as much as it being related to Alternative Music.
The comment in the question suggests you 'need know-how of a certain computer function.' yet no cryptography or maths is involved.
It could mean a very simple function like pressing a button, for an example, the 'alt' key? An alternative band like Alt + J perhaps?
I'm not familiar with the bands full discography so I did a search for 'Alt + J' songs with the words 'New Orleans' and I found a cover the band did of the song 'House of the Rising Sun', the first two lines being:
There is a house in New Orleans
They call the Rising Sun
These two lines may match the clue given where the words 'New Orleans' are located.
Understanding the code
So based on the bands name, I think I have an idea of how to 'decrypt' the text by assuming these numbers are 'alt-codes'. Thanks to the comment from kayzeroshort, we know the numbers which match the pattern '+XXXX' are unicode numbers.
The Alt code characters are pictographic forms and the Unicode characters appear to me more about general concepts.
The first line turns into:
∃ = There is (this character is a quantifier. It means "there exists".)
ª = A (looks like a small a)
⌂ = House (looks like a house)
⊂ = In (the mathematical symbol for 'subset')
...and we know that '29.9, -90' is the location for New Orleans.
The second line turns into:
OK = They (looks like a sitck figure person sideways, person ~= people ~= "They")
℡ = Call (TEL = Telephone ~= Call)
↑☼ = Rising Sun (These two clearly indicated a 'rising sun', up arrow + sun)