Agree, Tommy James was an excellent songwriter as well as an overall musician. What was so cool about music from that era was that people had to invent different methods to achieve different effects, "Crimson and Clover's" tremolo on steroids effect was made by doing this,
" The song contains a tremolo effect on the guitar, set so that it vibrated in time with the song's rhythm. Near the end of the recording, the band had an idea of utilizing the tremolo effect with vocals. To achieve this, the voice microphone was plugged into an Ampeg guitar amplifier with tremolo turned on, and the output from the amplifier was recorded while James sang "Crimson and clover, over and over".
Another song that used incredible inventive ideas was " I'm not in love" by 10cc, I remember when it was released, (yea, I'm old) and thinking, how did they do that?, it didn't sound like a synthesizer of any kind and it wasn't, here is a short documentary of the making of this pop masterpiece, just amazing IMO..
https://www.youtube.com/watch?v=Qq7oGenbp2I