For the most part, I like the look of the top one (a logo should be simple), but you should add the tag line of the bottom one.
You also may be missing out by having the mic as a separate thing, as it could totally replace one or both of the the "i"s in Gemini (actually, given that Gemini is the twins, both "i"s maybe)
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Co-host of
The Greatest Song Ever Sung (Poorly), a karaoke-themed podcast