I wasn't aware of Jonathan Mann's existence but I was following kind-of the same philosophy when creating music. During the last year, I might have completed more than a hundred compositions. I didn't write the songs myself, though. I just composed poems of my favorite poets.
Most of the compositions were mediocre, some were really bad, but there were a few which were pretty good. For me, the ratio might have been 75-20-5, but I guess this might get better if I keep at it. Maybe I'll also start posting my stuff somewhere in a year or two.