«What It Is» song by Mark KnopflerThe track «What It Is» appears in: Private Investigations: The Very Best Of Dire Straits And Mark Knopfler Date: 2005/11/15 Track: 18 / 22 Sailing to Philadelphia [Warner] Date: 2000/09/26 Track: 1 / 13 Sailing to Philadelphia [CD & DVA] Date: 2004/12/07 Track: 1 / 14 Sailing to Philadelphia [Mercury] Date: 2000/10/25 Track: 1 / 13 Mark Knopfler (Sound & Vision Q4 2007) Date: 2007/01/01 Track: 8 (Disc 2) / 22
![Sailing to Philadelphia [Warner]](https://www.sortmusic.com/covers_yaM/mark-knopfler/2000_170_170_Sailing%2520to%2520Philadelphia%2520%255BWarner%255D.jpg)
![Sailing to Philadelphia [CD & DVA]](https://www.sortmusic.com/covers_yaM/mark-knopfler/2004_170_147_Sailing%2520to%2520Philadelphia%2520%255BCD%2520%2526%2520DVA%255D.jpg)
![Sailing to Philadelphia [Mercury]](https://www.sortmusic.com/covers_yaM/mark-knopfler/2000_170_170_Sailing%2520to%2520Philadelphia%2520%255BMercury%255D.jpg)