I Know.

I'm sure in the verse when Brian sings while playing the acoustic there is no bass but here's a bass line which goes quite well under it if you want to play along:

[Verse]

|-----------------------------------------------------|

|-----------------------------------------------------|

|--------------------------------3-3-3-3-3-3-3-3-3-3--|

|--4-4-4-4-4-4-4--3-3-3-3-3-3-3-----------------------|

|-----------|

|-----------|

|--3-3-3-3--|

|-----------|

[Chorus]

|-----------------------------------------------|

|-----------------------------------------------|

|-----------------------------------------------|

|--1-1-1-1-1-1-1--3-3-3-3-3-3-3--4-4-4-4-4-4-4--|

|-----------------|

|-----------------|

|-----------------|

|--4-4-4-4-4-4-4--|

Repeat something like 4 times (I don't have the albumn on me at the moment) but on the last time before the didgeredoo comes in end on the 4th fret on the E string.

The next bit is where Brian does a sort of a solo:

|------------------------------------------------|

|------------------------------------------------|

|--------------------------------3-3-3--6-6-6-6--|

|--4-4-4-4-4-4-4--3-3-3-3-3-3-3------------------|

|----------------------|

|----------------------|

|--8-8-8--10-10-10-----|

|-------------------8--|

Repeat 3 times before doing the ending to it (below):

|-------------------------------------------------|

|-------------------------------------------------|

|--------------------------------3-3-3-3-3-3-3-3--|

|--4-4-4-4-4-4-4--3-3-3-3-3-3-3-------------------|

|-------------------|

|-------------------|

|--3-3-3-3-3-3-3-3--|

|-------------------|

Repeat the chorus 4 more times and let Brian play out quietly on the acoustic, done!!!