You think lead is bad? Every solder joint, even lead-free, generates a small thermocouple voltage. It's not normally a problem, but when you do metrology at the parts-per-million level, it shows up. Leeds & Northrup (and maybe others) used to sell special low thermal EMF solder. Great stuff, but it was an alloy of cadmium. They used to paint the solder joints in their equipment green to identify the ones with the cadmium low EMF stuff. Just more trivia to contaminate your minds 
How Japan Almit R19 solder compare with Mcap silver solder?
Which company oem solder for Mcap and siltech?
Which company oem solder for Mcap and siltech?
I would think that in most DIY audio the quality of the soldering is much more important than the quality of the solder. Fancy solders may require better technique so could actually be counter-productive except for those who really know what they are doing.
Actually eutectic solders require less soldering ability than "regular" alloys, and the flux makes a big difference too...
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