Warning: These are meant to be silly and weird. One could take them seriously, but maybe that would just make it funnier. Anyway, enjoy "volume one".
1. Mine-On the 20th Century- Mycroft and Sherlock singing? HINT: Trade all the female pronouns for male ones your Mystrade and Johnlock shippers out there!
2: Mother Knows Best *Reprise*-Tangled- Mycroft to Sherlock HINT: Replace Rapunzel with Sherlock, Mother with Brother (obv.)
3. He is Not Dead Yet- Spamalot- This just seems hilarious in ANY scenario, as long a Sherlock is involved.
Will post more! Have fun!