[BG Mushroom]
type = normal
spriteno = 3,0
start = -1000,150
delta = 1,1
velocity = -2
mask = 1
tile = 1,0
tilespacing = 2660,0
layerno = 0
[BG Mushroom]
type = normal
spriteno = 3,0
start = -1000,150
delta = 1,1
velocity = 2
mask = 1
tile = 1,0
tilespacing = 2660,0
layerno = 0
[BG Mushroom3]
type = normal
spriteno = 3,0
start = -1000,150
delta = 1,1
velocity = -2
mask = 1
tile = 1,0
tilespacing = 2660,0
layerno = 1
trans = addalpha
alpha = 256,158
[BG Mushroom4]
type = normal
spriteno = 3,0
start = -1000,150
delta = 1,1
velocity = 2
mask = 1
tile = 1,0
tilespacing = 2660,0
layerno = 1
trans = addalpha
alpha = 256,158
In case you're interested, here's a link to an online converter that I use with the music already uploaded. I think the time limit they keep the file is 24 hours.
https://www.online-convert.com/pt/result#j=d08b46df-7dec-4e54-b2d1-7df9df390bee