Mojang Studios

Background
Mojang Studios (formerly known as Mojang Specifications and Mojang AB) is a Swedish video game developer based in Stockholm, founded in 2009. It is the creator of the successful indie cult PC game Minecraft, which won many awards and has sold over 200+ copies as of 2021. On September 15, 2014, Microsoft announced its plans to purchase the company, which closed on November 6. On May 17, 2020, the company rebranded to its current name to aim to reflect its multi-studio structure.

1st Logo (July 9, 2010-February 21, 2011)
Logo: On a purple background, we see a light purple, pixelated, abstract object, which looks like a C-shaped dragon. Under it are the words "Mojang Specifications" in white.

Technique: None.

Music/Sounds: None.

Availability: Uncommonly seen, but still widely available if proper settings are enabled in the launcher. Seen at Minecraft versions from Alpha 1.0.4 to Beta 1.2, which can be played in the launcher if your profile allows these editions.

2nd Logo (February 22, 2011-October 1, 2013)
Logo: On a white background, we see the aforementioned pixelated object, now white and inside a box. Under it is the word "MOJANG".

Technique: None.

Music/Sounds: None.

Availability: Common. Seen at the beginning of Minecraft versions from Beta 1.3 through Beta 1.7.3. However this was kept on the Xbox 360 version through TU12.

3rd Logo (September 14, 2011-December 9, 2013)
Logo: Same as before, albeit vertical and no longer pixelated.

Variant: There are lots of different logo variants depending on what texture/resource pack you use, the texture pack support starts at Beta 1.8 and at 1.6.1, it became obsolete and replaced with the new resource pack support.

Technique: None.

Music/Sounds: None.

Availability: Common. Seen at the beginning of Minecraft versions from Beta 1.8 to 1.7.2.

4th Logo (0x10c variant) (2012-2013)
Logo: On a black background, the abstract object, now in metallic silver, reveals itself from the shadows.

Technique: 2D animation.

Music/Sounds: None.

Availability: Only appeared on Mojang's cancelled game, 0x10c (pronounced as "ten to the C power"), which was developed in 2012-2013.

5th Logo (December 10, 2013-May 20, 2020)
Logo: A redux of the 4th logo, which has the rounded square with its top-right and bottom-left corners now untamed and the name in a new corporate font.

Variants:
 * The resource pack you are using may variate the logo.
 * On Minecraft Mini Series: Challenge of the Spooky Isles, the logo shares the screen with the Microsoft Studios logo.

Technique: None.

Music/Sounds: None. The variant uses the closing theme.

Availability: No longer current. Seen at the beginning of Minecraft version 1.7.4 to Snapshot 20w20b and since TU13 and Minecraft Mini Series: Challenge of the Spooky Isles.

6th Logo (Minecraft Java Edition 3D Shareware v1.34 variant) (April 1, 2019)
Logo: It starts out on a white background. Then, a tiny square appears from the center, and spins until it comes into view. It is then revealed to be the Mojang logo from before, albeit pixelated. The text from the previous logo fades in below, also pixelated.

Technique: 2D animation.

Music/Sounds: Silence at first, then a choir sings the company name once the text fades in, a parody of the Sega logo.

Availability: Only seen on Minecraft 3D Shareware v1.34, which was released on April Fools' Day of that year.

7th Logo (May 17, 2020-)
Logo: On a background, we see 6 weird shapes with holes and indents in them, with either the whole shape or parts of the shape turning a few times. Then, once they stop turning, they each show "MOJANG" in an unusual typeface, with "STUDIOS" below.

Variant: A still version exists.

Technique: None, or CGI designed by Bold Scandinavia.

Music/Sounds: A synth theme with some sound effects, ending with the Minecraft exp. sound. None for the still version.

Availability: Seen on recent updates of Minecraft starting version 1.16. The animated version appears on Minecraft Dungeons.