So, we've got 2, 4 and 5.

2. Cypress (Come Away, Death / (eg) Going Down the Valley One by One)
4. Elm (When All Men Sing)
5. Ivy (North Country Maid / 3 Jolly Welshmen)

Now how about 6 and 7. I've clued you in too much on 6, but - to be honest - 7 started travelling just before 7:30.

;-)
Ian