It's cross to bear, bear in this case being used in the same sense it is in weight bearing, Greeks bearing gifts or even ball bearing. It refers back to the Biblical tale of Jesus carrying his cross to Golgotha.
Lookin' Out My Back Door. Lookin' Out My Back Door is a song recorded by the American band Creedence Clearwater Revival, also known as CCR. The song was written by the band's lead singer, guitarist, and songwriter, John Fogerty.
Knockin on Heaven's Door is a timeless song by Dylan that's been coverd countless times. It has some easy beginner chords, and the strumming isn't too complex. So, it's one of those easy songs for beginners if you haven't been playing for very long. For the rest of us it's a classic, so it's great anyways.