The only RBF song I know up to know. Easy and fun to play. I might tab Cheer Up, or the 
Trendy.

Tabbed By Joel C. of Maelstrom.

Anyway here it is.

|------------------------|
|------------------------|
|------------------------|
|-6-7--11-12-4-2--6-7----|
|-6-7--11-12-4-2--6-7----|
|-4-5--9--10-2-0--4-5----| x4

Refrain:

|------------------------------------|
|------------------------------------|
|------------------------------------|
|-11--12---------------------7-----7-|
|-11--12---------------------7-----7-|
|-9---10---10-8-10-12--12-12-5-----5-| x2

|------------------------------------------------------|
|------------------------------------------------------|
|------------------------------------------------------|
|-11--12---------------------11-11-9-7--12-------------|
|-11--12---------------------11-11-9-7--12-------------|
|-9---10---10-8-10-12--12-12-9--9--7-5--10--10-8-10-12-|

Repeat this twice,then play the following:

|---                             |
|---                             |
|---                             |
|---                             |
|---                             |
|-5-3-2-----3-4-5----------------| x4

(Trumpet solo, I might tab eventually)

Do the refrain again. When done keep doing this:

|------------------------|
|------------------------|
|------------------------|
|-6-7--11-12-4-2--6-7----|
|-6-7--11-12-4-2--6-7----|
|-4-5--9--10-2-0--4-5----| x4

Don't forget the fourth time, it ends with a different "interval". I'd use the word "beat".

There you have it! I'm pretty sure it's 100% correct. I mean, I play it that way.