Newb question..
hey guys 
so i uploaded this mix on youtube also on DJTT after but then i got some tips about music selection cause some songs were clashing and he started talking about A major etc, it was a really usefull tip but he didnt give me a term for that so i couldnt really search it are there any threads explaining this? is there any software that can figure out the key of your songs?
what keys mix well together and what keys dont?
i got so confused with all of this 
..
it´s called mixed in key. every track has a special key. check out the mixed in key software http://www.mixedinkey.com/
okay
God I can’t look at that damn wheel anymore. Brings back memories of 3am theory study sessions for the past four years 
What I think he was talking about is called harmonic mixing, which means taking two songs with similar keys and matching those keys which allows for an even smoother transition, and is an essential part of doing mashups. I’ve found that harmonic mixing typically sounds the best when done in the “perfect” intervals, namely the 1st, 4th, 5th, and 8th intervals. For example, matching a song in Amin with a song in Amaj will work fine, as it’s the same root note (A). Similarly, matching a song in Cmaj will match with Gmaj, because G is a perfect 5th from C, and thus harmonizes with C. Major/minor does play a role, however if you’re able to match the root notes of the two songs, then you should be golden most of the time. Noodling around on a piano for a bit and studying a small bit of chord theory will go a long way with this, namely knowing your perfect 4ths and 5ths. This is literally scratching the surface, but I hope it’s enough to help you get started in harmonic mixing
Nice info from Ed Paris, DJ Sunshine and Chocoslayer.
No worries. Basically every song has a “root” note, the note that the song comes back to. If you can hum a single note and the hummed note sounds like it goes with the song perfectly, you have more than likely found the root note. If you can find another song with either the same “root note” or one with a root note that compliments it (i.e. harmonizes with it), those work together great. If you do some delving into intervals, this should begin to make sense.
Oh, I went out sorry, if you want a free alternative rapid evolution 3 (google it) works fine once you suss it out
ahhh there you are haha 
i must thank you if you didnt watch the video i wouldnt have discovered all this about harmonic mixing and thanks to Ed paris and DJ Sunshine i understand it well at least i think i do haha this is just a wonderfull forum always makes me happy being on here ! and yea let me check out rapid evolution 3 even though i was thinking about buying mixed in key thanks Elliot1106
If you have the money then check some articles comparing the two, you might hit lucky with a search of the blog/forum
Welcome to music theory my friend. Yes, DJing is more than slamming some tracks together 
You can mix without worrying about keys, but it won’t sound as tight if the keys are all over the place.
(Is it too early to make a Whitney Huston joke? )
hahaha well i never thought it was just putting on 2 tracks or something and move your crossfader and ta-dah ur a DJ but yes me, i just really started getting serious about DJing so i have a lot to learn not that i mind it always excites me when i learn something new hehehe
Well, this is definitely a bottomless pit of stuff to learn. When you think you got it, something comes out that changes everything
There are things you know…
There are things you know you don’t know…
There are things you don’t know you don’t know…
It is amazing just how many things fall into the 3rd category until you reach mastery level in a skill, more specifically, the proportion of things in the first vs second categories once you’re at that point. It is too difficult to understand the overarching concepts as a beginner to even grasp the mastery-level concepts.
Sadly, this is probably even not a mastery-level concept… but just keep moving things from the bottom of the list to the top and you’ll get there some day ♪♫♪
those are some really wise words, you guys are making me even more excited then i already was to get deeper and deeper into the theory of DJing but this guy has to go to sleep do you guys know if there are any books about basicly everything u need to know about DJ/Music theory?
That would be a huge book considering some DJs do any of the following things which all require a different subset of skills:
Any of those could be their own book, or series of books. Additionally, there is the broader topic of music theory.
WAY too much for one book. You’re trying to figure out what is in that 3rd category all at once 
Start off with smaller, easy topics and research them yourself. The Internet is a wonderful thing.
Haha alright thanks i think that as i move on i will discover things i didnt know and learn them and so on glad im still young
