this is the F major scale 
if a song is in the key of f major then you can make a lead using these notes

|--------------------------------------------0--1--3--|      Thanks for pointing that out for me 
|--------------------------------------1--3-----------|             Revolutonxz 
|-----------------------------0--2--3-----------------|               
|--------------------0--2--3--------------------------|
|-----------0--1--3-----------------------------------|
|--0--1--3--------------------------------------------|


|--------------------------------------------3--5--6--|
|-----------------------------------3--5--6-----------|
|--------------------------2--3--5--------------------|
|-----------------2--3--5-----------------------------|
|-----------3--5--------------------------------------|
|--3--5--6--------------------------------------------|


|--------------------------------------------5--6--8--|
|-----------------------------------5--6--8-----------|
|-----------------------------5--7--------------------|
|--------------------5--7--8--------------------------|
|-----------5--7--8-----------------------------------|
|--5--6--8--------------------------------------------|