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10ac Bill enters cab. On the contrary suffering from inability to control movements: -T---C
20ac Take a back seat: -o-nt
29ac Physicist from Sweden has anxiety with gypsy: a-g-t-o-
3d Talk effusively about songlike hits' sound first: w--/--r-c-l
20d Heard girl's nickname: -o-i-e-

10a Ataxic
3d wax lyrical

10a - Ataxia; 29a - Angstrom (angst - anxiety - rom - romany; 3d wax lyrical; sorry can't help with 20d - haven't done it myself.

20. Moniker

MOUNT and ANGSTROM

might be of help. I can't remember the other at the moment