What is a COLLAGE ... or ColourCollage

To make collages its important to have a DEFINITION or an UNDERSTANDING - at least for one self.

Just leaving the atelier Im thinking I have a rather wide definition of collage

Wikipedia says:

Collage (From the French: coller, to glue, French pronunciation: ​[kɔ.laːʒ]) is a technique of art production, primarily used in the visual arts, where the artwork is made from an assemblage of different forms, thus creating a new whole.Read more here

Looking at my results from today

I havent use a lot of glue

today

its not visible 

but is there hide by the painting

I have used the 'paperlinnen' I made before christmas

as background for 3 of them

postcard for the rest

As different elements I used 

4 colours

 musicnodes

ink

I have to decide which colour I shall choose 

black or white

for the background

and 

the frame ...

That is not my best

It ended up to be 

 9  Music-Colours-Collages

with leftovers-colour from christmas

purple, red and gold

and the black dark weather in january

the black ink

and

music from both