Soundtrack, v1.00:

End Credits:

Summer Sunshine, by Holly Lindin
Queen of the Waves, by T-Marie
Swimmin' on Sunshine, based on Walking on Sunshine, by Kennedy Nöel
Additional DeepSea3 Player Music, by MRWILSONDJ
Show Me Some Love, by Chelsea Ward
Barbie Vox, by Emily Gomez
Queen of the Waves, Eris version, by Melissa Lyons and Kelly Sheridan



The times below relate to a 25fps DVD. A 23.976fps version will be likely to be 4% longer duration due to the playing rate being slower.

0:00:00, Barbie in A Mermaid Tale (2010) 01 Titles and Malibu Surf Sport, MUSIC, Summer Sunshine, by Holly Lindin
0:03:01, 02 Surfer, MUSIC, Queen of the Waves, by T-Marie
0:23:41, Kayla and Xylie, MUSIC, Swimmin' on Sunshine, by Kennedy Nöel
0:25:51, Additional DeepSea3 Player MUSIC, by MRWILSONDJ
0:52:39, A Gift For Eris, MUSIC, Queen of the Waves, Eris version, by Melissa Lyons and Kelly Sheridan
1:09:35, Surfer, MUSIC, Queen of the Waves, by T-Maria
1:10:17, end credits, MUSIC, Summer Sunshine, by Holly Lindin
1:13:51, 19 End

I could not find:
Show Me Some Love, by Chelsea Ward
Barbie Vox, by Emily Gomez