What's in their headphones when Mayweather and Marquez train? Here's a selection culled right from the sources themselves.

Floyd Mayweather's Top 10 Favorite Songs

Young Jeezy: Go Getta

Describes his life

Young Jeezy: Soul Survivor

Last man standing...Only one undefeated out here at his level

Red Café: Da Hottest in the Hood

He's the hottest from his hood

Ray J: Centerview

He likes Ray J as an artist and he supports his music

Michael Jackson: Don't Stop 'Til You get Enough

Reminds him of his work ethic, how hard he works and to keep putting work in

Michael Jackson: Working Day and Night

He puts in work 24/7

Michael Jackson: Rock With You

Reminds him of having a good time listening to good music.

Michael Jackson: Beat it

Self explanatory

Michael Jackson: Wanna be Startin Somethin

Likes to start stuff between people in his inner circle and keep it goin (all in good fun).

Young Jeezy: Bottom of the Map

Relates to the economic circumstances of where he comes from.

Juan Manuel Marquez's Top 10 Favorite Songs

Miguel Mateos: Cuando Sea Grande

I'd like this song because it was very popular and its music and words were very good the first time I heard it.

Miguel Bosé y Benny Ibarra: Si Puedo Volverte a Ver

This song made me remember very good things when I was in the school

Chicago: If You Leave Me Now

Very romantic song that makes me feel relax, without any problem

La Ley: "Día Cero"

"I'd like the words and the music. Very popular song that everybody likes"

Miguel Bosé : Hacer Por Hacer

"This song makes me feel very happy. Is one of my favorites for all its meaning"

Enrique Iglesias : Don't Turn Off The Lights

"The voice of the singer and the words makes a big impact in my emotions"

Benny Ibarra: "Déjalo Ir"

"This song has a great sense of romanticism. This song always makes feel like I am somebody important that everybody needs"

Alejandro Fernández: Mátalas

This song is the most I like to hear at any moment. I really like to hear the voice of Alejandro Fernandez, one of my favorite singers.

Alejandro Fernández: Loco

A great piece of music and words. I love this song because it says so much about the life

Alejandro Fernández : Te Voy A Perder

Another great song from Fernandez. I love most his songs because are easy to understand and it means a lot