In The Summertime Sheet Music For Mandolin And Banjo
In The Summertime Was a hit song in 1970 by Mongo Jerry. The words and music are by Ray Dorset and the sheet music is in the key of G Major. The letter notes are included.
That B note in the second line of the letter notes is a low B note. All the F notes are sharp
And here's the sheet music tab in a higher key of G with all the lyrics.