In general, Qonell's Jazz themes tend to be very good and smooth on their own but don't catch the mood of the original. This is my favourite of them because it captures the mood of Credens justitiam as well as jazz can be expected to.
_Puella Magi Madoka Magica_ Mami's Theme *Credens justitiam* for E-guitar, Flute, Piano, Double bass and Drums (Jazz ver.) This is another version of Mami's theme. It's faster and not as chill as the other one. You can find the other version in the playlist I linked in the description.
In the description: www.wallpaperup.com/367502/akemi_homura_hat_kaname_madoka_mahou_shoujo_madoka_magica_miki_sayaka_okuba_sakura_kyouko_suit_sunglasses_tie_tomoe_mami.html