WordNet

sing a descant on a main tune or melody
indicates continuity or persistence or concentration; "his spirit lives on"; "shall I read on?"
(of events) planned or scheduled; "the picnic is on, rain or shine"; "we have nothing on for Friday night"
in a state required for something to function or be effective; "turn the lights on"; "get a load on"
in operation or operational; "left the oven on"; "the switch is in the on position"
talk at great length about something of ones interest
a decorative musical accompaniment (often improvised) added above a basic melody (同)discant
sing in descant

PrepTutorEJDIC

(また《文》upon)《位置・場所》…『の上に』,の上で,の上の / (また《文》upon)《運動・動作の方向・対象》…『に』[向かって] / 《話》…を身につけて / (また《文》upon)《近接して場所》…の近くに,…に面して,…の側に / 《特定の日時》…『に』 / 《状態》…『して』,…中で,…すると / (また《文》upon)…『について』,…に関して / 《目的》…『で』,…に / (また《文》upon)…に基づいて,…によって,…の支え(助け)で / 《所属を表して》(委員会・チームなどの)一員で / (また《文》upon)…を軸にして,…で / (また《文》upon)《前後に同じ名詞を並べて》…に加えて,…についで / 『上に』,『身につけて』 / (電気・水道・ガス・ラジオなどが)『ついて』,通じて / 行われて,続けて,従事して / 《時の副詞[句]を伴って》前方へ,ずっと
(定旋律につく)随唱,随奏 / 随唱(奏)する / 《文》(…について)長々と(詳しく)述べる《+『on』(『upon』)+『名』》

On the relation between the EMG frequency spectrum and the duration of symptoms in lesions of the peripheral motor neuron.

Larsson LE.
Electroencephalography and clinical neurophysiology.Electroencephalogr Clin Neurophysiol.1975 Jan;38(1):69-78.
Two samples of muscles, one with proved, the other with doubtful neurogenic lesions have been investigated with EMG frequency analysis. Confirming reports from previous authors it was possible to show that a large proportion of muscles with proved lesions have a displacement of the frequency spectru
PMID 45905

And descant on mine own deformities; an experiment in special needs for the cerebral palsied.