[…] pithless arms, like to a wither’d vine That droops his sapless branches to the ground;

In fact, Miles went into jazz-rock-funk by deeply participating to create this musical movement end of 60s. So, during this period, he mixed influnces from Jimi Hendrix and Sly Stone in jazz and was admirating those musicians.

I'd bet against his succeeding.

But, you ought to recollect, she says that the annuity was not to be paid, but was to accumulate in my hands as a capital for Jenny's behoof; and then, to prevent all doubt, it goes on to reoblige her to pay a perpetual annuity of L. 300 to Miss Jenny Buchanan as long as she should continue with her, to be accumulated in her own hands during her life, and paid to Miss Jenny, with accumulated interest, after her death.