The Warner Bros company began in 1918 when four brothers started a business in television and film. However, the logo wasn't seen until 1923 and the colored variation wasn't put to use until 1948.  The colored variation shown above is a commemorative logo that was introduced in 2012 for the company's 90th anniversary. The logo uses custom typeface and while there are different variations of the logo it has remained consistent with design and font through the years.  When I was a kid I watched a lot of Looney Tunes so every time I see this logo I imagine Bugs Bunny standing next to it with a carrot in hand.

info from - http://famouslogos.net/warner-bros-logo/

I like the Youtube logo because it is simple but represents its website perfectly.  It is nice that the red box that is used in the logo is the shape of an older, more retro television screen.  Youtube was started in February 2005 but I am unsure as to whether  or  not the founders of Youtube designed the logo or not.  Apparently the logo has undergone a few changes since the website was started in 2005, but it doesn't seem to have effected the recognition of the logo or the website that it represents. The font used for the logo is alternate gothic.

info from - http://famouslogos.net/youtube-logo/

The Xerox company was started in 1906 but at the time was called the "Haloid Photographic company.  Its current name wasn't in use until 1961.  The company manufactures printers and photocopiers.  As you can see by the examples I have given the logo has undergone a lot of changes through the years, which doesn't really help with logo recognition.  Despite this, the company seems to be doing just fine.  I do like the new logo much more that the previous logos because it is much more interesting to look at with the incorporation of a symbol. The placement of the symbol is also pretty good.

Info from -  http://famouslogos.net/xerox-logo/

This famous European sportswear company has a memorable and recognizable logo that was designed by Adolf "Adi" Dassler.  His brother Rudolf Dassler also assisted in its design.  The logo font is a custom typeface that works very well.  One of the things that makes this logo somewhat unique is that all the font is lowercase.  The logo has evolved but still retains its recognizable features.  The current logo is meant to represent mountains and the goals that want to be reached. The logo is a good example of creative simplicity in design.

info from - http://famouslogos.net/adidas-logo/

Yamaha corporation is a Japanese Conglomerate that was founded in October 1887.  The company manufactures motorcycles, musical instruments, and more.  The logo hasn't changed much since its creation in 1967 which helps with the recognition of the logo.  The symbol has three overlapping tuning forks which create the shape of a Y.  I like the way this logo was put together because the symbol and the font are about the same height and everything is very uniform.  I also like the simple san serif font that was used for the logo.

info from - http://famouslogos.net/yamaha-logo/

 
Linkin Park is a metal/rap band group that was started in 1996.  I am unfamiliar with this band but I have heard of them, and apparently their music is very popular.  The logo that they use now is part of the art from a successful 2007 album.  I don't know who designed the logo, but I like the symbol and font that is used in the logo.  The symbol has a lot of movement to keep the viewer interested.  I didn't notice this at first but there is an L and P in the symbol. 

info from - http://famouslogos.net/linkin-park-logo/

The Adobe company was started in 1982 by John Warnock and Charles Geschke.  John Warnocks wife, Marva, designed the logo, but the logo has been modified to its current version which is red and white.  I do like the new logo more than the old one, but perhaps this is because it is brighter.  While the logos loosely resemble one another, they are still very different from one another. While this may have effected the logos recognition in the eye of the general public it doesn't seem to have effected to popularity of the company itself.

info from - http://famouslogos.net/adobe-logo/