MY PUZZLE OF DREAMS (BLUE TATTOO) – Confirmed
This song is another cover of David Brandes’ group E-Rotic, where the song is titled “Save Me”, released in 1997. The sample of this song was later used by another Brandes’ group called Shanadoo in 2006 and was renamed “Wake Me”.
Hear E-Rotic’s versionHear Shanadoo’s version

CORNER OF MY MIND (BLUE TATTOO) – Confirmed
“Corner of My Mind” has identical melody and very similar chorus to “Don’t Go Too Fast”, but another pace. Just check the sample!
Hear comparison

HELLRACER (BLUE TATTOO) – Confirmed
This time Vanilla Ninja were first, but another Bros Music artist, a German singer named Gracia recorded her version. Her song titled “Sacrifice Me” has many identical music parts to “Hellracer”.
Hear Gracia’s version

WHEN THE INDIANS CRY (TRACES OF SADNESS) – Confirmed
This song was originally recorded by Bros Music musician Chris Norman in 2001, 3 years before Vanilla Ninja. Lyrics and music are exactly the same. This song was also recorded by other Bros Music artist Lydia Madajewski from the band E-Rotic.
Hear Chris Norman’s versionHear Lydia’s version

STAY (TRACES OF SADNESS) – Confirmed
This song was originally recorded by Bros Music musician Chris Norman in 2000, 4 years before Vanilla Ninja. Lyrics and music are exactly the same.
Hear Chris Norman’s version

DON’T YOU REALIZE (TRACES OF SADNESS) – Confirmed
This song was originally recorded by David Brandes and Lydia Madajewski in 2002, 2 years before Vanilla Ninja. The original title of this song is “Don’t You See The Light”. The lyrics are a little bit different from Vanilla Ninja’s version.
Hear their version

DON’T GO TOO FAST (TRACES OF SADNESS) – Unconfirmed
This song is similar to “Stranger by the Day” by Shades Apart, but no one has proved it is the same song. Verses of “Shadow…” are quite similar to chorus of “Don’t Go Too Fast”.
Hear Shades Apart’s version

TOUGH ENOUGH (TRACES OF SADNESS) – Unconfirmed
This song is very similar to “Rock me Amadeus” by Falco. One of the youtubers posted a video proving that these 2 songs have the same melody.